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  • error when plotting log'd array in matplotlib/scipy/numpy

    - by user248237
    I have two arrays and I take their logs. When I do that and try to plot their scatter plot, I get this error: File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7892-py2.6-macosx-10.6-universal.egg/matplotlib/pyplot.py", line 2192, in scatter ret = ax.scatter(x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, faceted, verts, **kwargs) File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7892-py2.6-macosx-10.6-universal.egg/matplotlib/axes.py", line 5384, in scatter self.add_collection(collection) File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7892-py2.6-macosx-10.6-universal.egg/matplotlib/axes.py", line 1391, in add_collection self.update_datalim(collection.get_datalim(self.transData)) File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7892-py2.6-macosx-10.6-universal.egg/matplotlib/collections.py", line 153, in get_datalim offsets = transOffset.transform_non_affine(offsets) File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7892-py2.6-macosx-10.6-universal.egg/matplotlib/transforms.py", line 1924, in transform_non_affine self._a.transform(points)) File "/Library/Python/2.6/site-packages/matplotlib-1.0.svn_r7892-py2.6-macosx-10.6-universal.egg/matplotlib/transforms.py", line 1420, in transform return affine_transform(points, mtx) ValueError: Invalid vertices array. the code is simply: myarray_x = log(my_array[:, 0]) myarray_y = log(my_array[:, 1]) plt.scatter(myarray_x, myarray_y) any idea what could be causing this? thanks.

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  • Draw a column graph with no space between columns

    - by Andrew Shepherd
    I am using the WPF toolkit, and am trying to render a graph that looks like a histogram. In particular, I want each column to be right up against each other column. There should be no gaps between columns. There are a number of components that you apply when creating a column graph. (See example XAML below). Does anybody know if there is a property you can set on one of the elements which refers to the width of the white space between columns? <charting:Chart Height="600" Width="Auto" HorizontalAlignment="Stretch" Name="MyChart" Title="Column Graph" LegendTitle="Legend"> <charting:ColumnSeries Name="theColumnSeries" Title="Series A" IndependentValueBinding="{Binding Path=Name}" DependentValueBinding="{Binding Path=Population}" Margin="0" > </charting:ColumnSeries> <charting:Chart.Axes> <charting:LinearAxis Orientation="Y" Minimum="200000" Maximum="2500000" ShowGridLines="True" /> <charting:CategoryAxis Name="chartCategoryAxis" /> </charting:Chart.Axes> </charting:Chart>

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  • How to draw line inside a scatter plot

    - by ruffy
    I can't believe that this is so complicated but I tried and googled for a while now. I just want to analyse my scatter plot with a few graphical features. For starters, I want to add simply a line. So, I have a few (4) points and like in this plot [1] I want to add a line to it. http://en.wikipedia.org/wiki/File:ROC_space-2.png [1] Now, this won't work. And frankly, the documentation-examples-gallery combo and content of matplotlib is a bad source for information. My code is based upon a simple scatter plot from the gallery: # definitions for the axes left, width = 0.1, 0.85 #0.65 bottom, height = 0.1, 0.85 #0.65 bottom_h = left_h = left+width+0.02 rect_scatter = [left, bottom, width, height] # start with a rectangular Figure fig = plt.figure(1, figsize=(8,8)) axScatter = plt.axes(rect_scatter) # the scatter plot: p1 = axScatter.scatter(x[0], y[0], c='blue', s = 70) p2 = axScatter.scatter(x[1], y[1], c='green', s = 70) p3 = axScatter.scatter(x[2], y[2], c='red', s = 70) p4 = axScatter.scatter(x[3], y[3], c='yellow', s = 70) p5 = axScatter.plot([1,2,3], "r--") plt.legend([p1, p2, p3, p4, p5], [names[0], names[1], names[2], names[3], "Random guess"], loc = 2) # now determine nice limits by hand: binwidth = 0.25 xymax = np.max( [np.max(np.fabs(x)), np.max(np.fabs(y))] ) lim = ( int(xymax/binwidth) + 1) * binwidth axScatter.set_xlim( (-lim, lim) ) axScatter.set_ylim( (-lim, lim) ) xText = axScatter.set_xlabel('FPR / Specificity') yText = axScatter.set_ylabel('TPR / Sensitivity') bins = np.arange(-lim, lim + binwidth, binwidth) plt.show() Everything works, except the p5 which is a line. Now how is this supposed to work? What's good practice here?

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  • creating a color coded time chart using colorbar and colormaps in python

    - by Rusty
    I'm trying to make a time tracking chart based on a daily time tracking file that I used. I wrote code that crawls through my files and generates a few lists. endTimes is a list of times that a particular activity ends in minutes going from 0 at midnight the first day of the month to however many minutes are in a month. labels is a list of labels for the times listed in endTimes. It is one shorter than endtimes since the trackers don't have any data about before 0 minute. Most labels are repeats. categories contains every unique value of labels in order of how well I regard that time. I want to create a colorbar or a stack of colorbars (1 for eachday) that will depict how I spend my time for a month and put a color associated with each label. Each value in categories will have a color associated. More blue for more good. More red for more bad. It is already in order for the jet colormap to be right, but I need to get desecrate color values evenly spaced out for each value in categories. Then I figure the next step would be to convert that to a listed colormap to use for the colorbar based on how the labels associated with the categories. I think this is the right way to do it, but I am not sure. I am not sure how to associate the labels with color values. Here is the last part of my code so far. I found one function to make a discrete colormaps. It does, but it isn't what I am looking for and I am not sure what is happening. Thanks for the help! # now I need to develop the graph import numpy as np from matplotlib import pyplot,mpl import matplotlib from scipy import interpolate from scipy import * def contains(thelist,name): # checks if the current list of categories contains the one just read for val in thelist: if val == name: return True return False def getCategories(lastFile): ''' must determine the colors to use I would like to make a gradient so that the better the task, the closer to blue bad labels will recieve colors closer to blue read the last file given for the information on how I feel the order should be then just keep them in the order of how good they are in the tracker use a color range and develop discrete values for each category by evenly spacing them out any time not found should assume to be sleep sleep should be white ''' tracker = open(lastFile+'.txt') # open the last file # find all the categories categories = [] for line in tracker: pos = line.find(':') # does it have a : or a ? if pos==-1: pos=line.find('?') if pos != -1: # ignore if no : or ? name = line[0:pos].strip() # split at the : or ? if contains(categories,name)==False: # if the category is new categories.append(name) # make a new one return categories # find good values in order of last day newlabels=[] for val in getCategories(lastDay): if contains(labels,val): newlabels.append(val) categories=newlabels # convert discrete colormap to listed colormap python for ii,val in enumerate(labels): if contains(categories,val)==False: labels[ii]='sleep' # create a figure fig = pyplot.figure() axes = [] for x in range(endTimes[-1]%(24*60)): ax = fig.add_axes([0.05, 0.65, 0.9, 0.15]) axes.append(ax) # figure out the colors to use # stole this function to make a discrete colormap # http://www.scipy.org/Cookbook/Matplotlib/ColormapTransformations def cmap_discretize(cmap, N): """Return a discrete colormap from the continuous colormap cmap. cmap: colormap instance, eg. cm.jet. N: Number of colors. Example x = resize(arange(100), (5,100)) djet = cmap_discretize(cm.jet, 5) imshow(x, cmap=djet) """ cdict = cmap._segmentdata.copy() # N colors colors_i = np.linspace(0,1.,N) # N+1 indices indices = np.linspace(0,1.,N+1) for key in ('red','green','blue'): # Find the N colors D = np.array(cdict[key]) I = interpolate.interp1d(D[:,0], D[:,1]) colors = I(colors_i) # Place these colors at the correct indices. A = zeros((N+1,3), float) A[:,0] = indices A[1:,1] = colors A[:-1,2] = colors # Create a tuple for the dictionary. L = [] for l in A: L.append(tuple(l)) cdict[key] = tuple(L) # Return colormap object. return matplotlib.colors.LinearSegmentedColormap('colormap',cdict,1024) # jet colormap goes from blue to red (good to bad) cmap = cmap_discretize(mpl.cm.jet, len(categories)) cmap.set_over('0.25') cmap.set_under('0.75') #norm = mpl.colors.Normalize(endTimes,cmap.N) print endTimes print labels # make a color list by matching labels to a picture #norm = mpl.colors.ListedColormap(colorList) cb1 = mpl.colorbar.ColorbarBase(axes[0],cmap=cmap ,orientation='horizontal' ,boundaries=endTimes ,ticks=endTimes ,spacing='proportional') pyplot.show()

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  • Swept AABB vs Line Segment 2D

    - by Larolaro
    I've really exhausted as much as Google has to give, I've spent a solid week googling every combination of words for an "AABBvsLine sweep", downloaded countless collision demos, dissected SAT intersection examples and an AABBvsAABB sweep trying to figure out how to approach this. I've not found a single thing covering this specific pairing. Can anyone shed any light on how to get the hit time of a swept AABB vs a Line segment in 2D? I'm still getting familiar with the SAT but I do know how to implement it to a degree, I'm just not sure how to extract the hit time from the velocity in the non axis aligned separating axes for the sweep. I really would appreciate anything at the moment, some code or even some helpful links, I'm at my wits end!

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  • "Marching cubes" voxel terrain - triplanar texturing with depth?

    - by Dan the Man
    I am currently working on a voxel terrain that uses the marching cubes algorithm for polygonizing the scalar field of voxels. I am using a triplanar texturing shader for texturing. say I have a grass texture set to the Y axis and a dirt texture for both the X and Z axes. Now, when my player digs downwards, it still appears as grass. How would I make it to appear as dirt? I have been thinking about this for a while, and the only thing I can think of to make this effect, would be to mark vertices that have been dug with a certain vertex color. When it has that vertex color, the shader would apply that dirt texture to the vertices marked. Is there a better method?

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  • How do you turn a cube into a sphere?

    - by Tom Dalling
    I'm trying to make a quad sphere based on an article, which shows results like this: I can generate a cube correctly: But when I convert all the points according to this formula (from the page linked above): x = x * sqrtf(1.0 - (y*y/2.0) - (z*z/2.0) + (y*y*z*z/3.0)); y = y * sqrtf(1.0 - (z*z/2.0) - (x*x/2.0) + (z*z*x*x/3.0)); z = z * sqrtf(1.0 - (x*x/2.0) - (y*y/2.0) + (x*x*y*y/3.0)); My sphere looks like this: As you can see, the edges of the cube still poke out too far. The cube ranges from -1 to +1 on all axes, like the article says. Any ideas what is wrong?

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  • Pitch camera around model

    - by ChocoMan
    Currently, my camera rotates with my model's Y-Axis (yaw) perfectly. What I'm having trouble with is rotating the X-Axis (pitch) along with it. I've tried the same method for cameraYaw() in the form of cameraPitch(), while adjusting the axis to Vector.Right, but the camera wouldn't pitch at all in accordance to the Y-Axes of the controller. Is there a way similar to this to get the same effect for pitching the camera around the model? // Rotates model on its own Y-axis public void modelRotMovement(GamePadState pController) { Yaw = pController.ThumbSticks.Right.X * MathHelper.ToRadians(speedAngleMAX); AddRotation = Quaternion.CreateFromYawPitchRoll(Yaw, 0, 0); ModelLoad.MRotation *= AddRotation; MOrientation = Matrix.CreateFromQuaternion(ModelLoad.MRotation); } // Orbit (yaw) Camera around model public void cameraYaw(Vector3 axis, float yaw, float pitch) { Pitch = pController.ThumbSticks.Right.Y * MathHelper.ToRadians(speedAngleMAX); ModelLoad.CameraPos = Vector3.Transform(ModelLoad.CameraPos - ModelLoad.camTarget, Matrix.CreateFromAxisAngle(axis, yaw)) + ModelLoad.camTarget; } public void updateCamera() { cameraYaw(Vector3.Up, Yaw); }

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  • Premières informations sur Ubuntu 10.10, "Maverick Meerkat" devrait être plus léger, plus rapide et

    Premières informations sur Ubuntu 10.10 « Maverick Meerkat » devrait être plus léger, plus rapide et très axé «social» Le prochain Ubuntu 10.10 s'appellera « Maverick Meerkat ». La distribution devrait par ailleurs sortir en octobre. Le créateur d'Ubuntu - et Pdg de Canonical, la société qui en soutient le développement - vient de dévoiler les premières informations et quelques axes de développement du projet. Mark Shuttleworth entend faire de cette version la « Perfect 10 ». En d'autres termes, continuer le mouvement vers un OS plus « léger » et plus rapide. Dans cette optique, une version officielle et spécialement conçue pour les netb...

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  • Calculate an AABB for bone animated model

    - by Byte56
    I have a model that has its initial bounding box calculated by finding the maximum and minimum on the x, y and z axes. Producing a correct result like so: The vertices are then stored in a VBO and only altered with matrices for rotation and bone animation. Currently the bounds are not updated when the model is altered. So the animated and rotated model has bounds like so: (Maybe it's hard to tell, but the bounds are the same as before, and don't accurately represent the rotated/animated model) So my question is, how can I calculate the bounding box using the armature matrices and rotation/translation matrices for each model? Keep in mind the modified vertex data is not available because those calculations are performed on the GPU in the shader. The end result I want is to have an accurate AABB the represents the animated model for picking/basic collision checks.

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  • How is the gimbal locked problem solved using accumulative matrix transformations

    - by Luke San Antonio
    I am reading the online "Learning Modern 3D Graphics Programming" book by Jason L. McKesson As of now, I am up to the gimbal lock problem and how to solve it using quaternions. However right here, at the Quaternions page. Part of the problem is that we are trying to store an orientation as a series of 3 accumulated axial rotations. Orientations are orientations, not rotations. And orientations are certainly not a series of rotations. So we need to treat the orientation of the ship as an orientation, as a specific quantity. I guess this is the first spot I start to get confused, the reason is because I don't see the dramatic difference between orientations and rotations. I also don't understand why an orientation cannot be represented by a series of rotations... Also: The first thought towards this end would be to keep the orientation as a matrix. When the time comes to modify the orientation, we simply apply a transformation to this matrix, storing the result as the new current orientation. This means that every yaw, pitch, and roll applied to the current orientation will be relative to that current orientation. Which is precisely what we need. If the user applies a positive yaw, you want that yaw to rotate them relative to where they are current pointing, not relative to some fixed coordinate system. The concept, I understand, however I don't understand how if accumulating matrix transformations is a solution to this problem, how the code given in the previous page isn't just that. Here's the code: void display() { glClearColor(0.0f, 0.0f, 0.0f, 0.0f); glClearDepth(1.0f); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glutil::MatrixStack currMatrix; currMatrix.Translate(glm::vec3(0.0f, 0.0f, -200.0f)); currMatrix.RotateX(g_angles.fAngleX); DrawGimbal(currMatrix, GIMBAL_X_AXIS, glm::vec4(0.4f, 0.4f, 1.0f, 1.0f)); currMatrix.RotateY(g_angles.fAngleY); DrawGimbal(currMatrix, GIMBAL_Y_AXIS, glm::vec4(0.0f, 1.0f, 0.0f, 1.0f)); currMatrix.RotateZ(g_angles.fAngleZ); DrawGimbal(currMatrix, GIMBAL_Z_AXIS, glm::vec4(1.0f, 0.3f, 0.3f, 1.0f)); glUseProgram(theProgram); currMatrix.Scale(3.0, 3.0, 3.0); currMatrix.RotateX(-90); //Set the base color for this object. glUniform4f(baseColorUnif, 1.0, 1.0, 1.0, 1.0); glUniformMatrix4fv(modelToCameraMatrixUnif, 1, GL_FALSE, glm::value_ptr(currMatrix.Top())); g_pObject->Render("tint"); glUseProgram(0); glutSwapBuffers(); } To my understanding, isn't what he is doing (modifying a matrix on a stack) considered accumulating matrices, since the author combined all the individual rotation transformations into one matrix which is being stored on the top of the stack. My understanding of a matrix is that they are used to take a point which is relative to an origin (let's say... the model), and make it relative to another origin (the camera). I'm pretty sure this is a safe definition, however I feel like there is something missing which is blocking me from understanding this gimbal lock problem. One thing that doesn't make sense to me is: If a matrix determines the difference relative between two "spaces," how come a rotation around the Y axis for, let's say, roll, doesn't put the point in "roll space" which can then be transformed once again in relation to this roll... In other words shouldn't any further transformations to this point be in relation to this new "roll space" and therefore not have the rotation be relative to the previous "model space" which is causing the gimbal lock. That's why gimbal lock occurs right? It's because we are rotating the object around set X, Y, and Z axes rather than rotating the object around it's own, relative axes. Or am I wrong? Since apparently this code I linked in isn't an accumulation of matrix transformations can you please give an example of a solution using this method. So in summary: What is the difference between a rotation and an orientation? Why is the code linked in not an example of accumulation of matrix transformations? What is the real, specific purpose of a matrix, if I had it wrong? How could a solution to the gimbal lock problem be implemented using accumulation of matrix transformations? Also, as a bonus: Why are the transformations after the rotation still relative to "model space?" Another bonus: Am I wrong in the assumption that after a transformation, further transformations will occur relative to the current? Also, if it wasn't implied, I am using OpenGL, GLSL, C++, and GLM, so examples and explanations in terms of these are greatly appreciated, if not necessary. The more the detail the better! Thanks in advance...

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  • Webcast Oracle: La gouvernance des données de référence pour les départements Finance

    - by Louisa Aggoune
    Inscrivez-vous dès maintenant à la session webcast du 11 juillet, de 11h à 12h organisée pour le lancement d’Oracle Data Relationship Governance Vous souhaitez centraliser et partager les données de référence des différentes applications de votre système d’information Finance pour en assurer la cohérence et en diminuer les coûts de réconciliation? Cette session est une opportunité unique de découvrir les avantages pour votre entreprise de l’offre "Oracle DRG – Data Relationship Governance". En échangeant avec nos experts dans le cadre d’une session interactive et d’une démonstration de la plateforme, vous découvrirez : Une application dédiée à la gestion des données de référence Finance : plans de comptes, entités légales, axe organisation, axes analytiques. Un processus de mise à jour du référentiel Finance via un workflow. Comment garantir la cohérence des données de référence. L’audit et l’historisation du référentiel Finance pour répondre aux exigences de contrôle et de traçabilité de la loi Sarbanes-Oxley. Détails de l'événement: Jeudi 11 juillet 2013: 11:00 – 12:00 Pour vous inscrire : cliquez içi

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  • How to mimic the same fixed-size horizon as in this racing game?

    - by Aybe
    I am trying to replicate the same horizon (buildings and sky) as in the image below: As you can see, the player has advanced in a straight line, yet the horizon has still the same size: This is my attempt using 3D, while it's okay when the player is on the start line: It's not so great when the player advanced as much as in the image no. 2: This is an overview of where the horizon buildings and sky are located: Obviously this won't achieve such effect when one is close to it, so I've tried to scale up the horizon on all axes but the problem is that the buildings are too small depending where you look at them from. How can one mimic such rendering ?

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  • Using Microsoft&apos;s Chart Controls In An ASP.NET Application: Serializing Chart Data

    In most usage scenarios, the data displayed in a Microsoft Chart control comes from some dynamic source, such as from a database query. The appearance of the chart can be modified dynamically, as well; past installments in this article series showed how to programmatically customize the axes, labels, and other appearance-related settings. However, it is possible to statically define the chart's data and appearance strictly through the control's declarative markup. One of the demos examined in the <a href="http://www.4guysfromrolla.com/articles/072209-1.aspx">Getting Started</a> article rendered a column chart with seven columns whose labels and values were defined statically in the <code>&lt;asp:Series&gt;</code> tag's

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  • Quelle est la place des mobiles en entreprise ? De quel service de téléphonie votre entreprise a-t-e

    Quelle est la place des mobiles en entreprise ? De quel service de téléphonie votre entreprise a-t-elle le plus besoin ? Microsoft lance une grande campagne pour promouvoir son OS mobile Windows Phone. La firme cherche particulièrement à atteindre les entreprises, en leur promettant que "grande entreprise ou PME, il existe forcément une solution Windows Phone pour vous." Voici les cinq grands axes autour desquels s'articulent l'emploi de Windows Phone dans les entreprises : - Gestion de la relation client Grâce aux solutions de gestion de la relation client, vous pouvez consulter les toutes dernières données de vente...

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  • Oracle dévoile sa Roadmap pour Java, améliorations de la JVM, support du Cloud, fonctionnalités objet et optimisations avancées

    Oracle dévoile sa RoadMap pour Java améliorations de la JVM, support du Cloud et fonctionnalités objet Oracle a dévoilé, lors de la conférence QCon de Londres, sa feuille de route pour le langage Java pour les années à venir. QCon est un événement annuel sur le développement logiciel pour les développeurs, les chefs de projet, les architectes et les analystes métiers. Il porte essentiellement sur la présentation de nouvelles innovations pour Java, .NET, HTML5, mobile et méthodes agiles. Les plans d'Oracle pour le futur sont essentiellement axés sur les améliorations et l'introduction des fonctionnalités objet, la facilité d'utilisation, le support du Cloud computing et des...

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  • Microsoft lance les Windows Store App Labs, des laboratoires de développement qui seront ouverts dans 30 villes, dont Paris

    Windows Store App Labs : Microsoft se rapproche des développeurs et ouvre des laboratoires de développement dans 30 villes, dont Paris L'un des axes adoptés par Microsoft pour une forte adoption de Windows 8 est le rapprochement avec les développeurs. La société vient d'annoncer le lancement des Windows Store App Labs dans plus de 30 villes du monde. Les Windows Store App Labs seront les lieux de référence où tous les concepteurs d'applications ? développeurs, designers et entrepreneurs ? pourront obtenir des nouveaux appareils Windows 8, de l'aide technique et des conseils sur la conception de l'interface utilisateur. Les développeurs pourront y tester leur...

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  • BounceEase and silverlight 4 BarSeries

    - by Pharabus
    Hi, I am trying to get a bar series to "bounce" when drawing, I assumed the BounceEase TransitionEasingFunction would do this but the lines just fade in, I have posted the xaml and code behind below, does anyone know where I have gone wrong or is it more complex than I though, I am fairly new to silverlight XAML <Grid x:Name="LayoutRoot" Background="White"> <chartingToolkit:Chart x:Name="MyChart"> <chartingToolkit:BarSeries Title="Sales" ItemsSource="{Binding}" IndependentValuePath="Name" DependentValuePath="Value" AnimationSequence="FirstToLast" TransitionDuration="00:00:3"> <chartingToolkit:BarSeries.TransitionEasingFunction> <BounceEase EasingMode="EaseInOut" Bounciness="5" /> </chartingToolkit:BarSeries.TransitionEasingFunction> <chartingToolkit:BarSeries.DataPointStyle> <Style TargetType="Control"> <Setter Property="Background" Value="Red"/> </Style> </chartingToolkit:BarSeries.DataPointStyle> </chartingToolkit:BarSeries> <chartingToolkit:Chart.Axes> <chartingToolkit:LinearAxis Title="Types owned" Orientation="X" Minimum="0" Maximum="300" Interval="10" ShowGridLines="True" FontStyle='Italic'/> </chartingToolkit:Chart.Axes> </chartingToolkit:Chart> </Grid> code behind public class MyClass : DependencyObject { public string Name { get; set; } public Double Value { get { return (Double)GetValue(myValueProperty); } set{SetValue(myValueProperty,value);} } public static readonly DependencyProperty myValueProperty = DependencyProperty.Register("Value", typeof(Double), typeof(MyClass), null); } public MainPage() { InitializeComponent(); //Get the data IList<MyClass> l = this.GetData(); //Get a reference to the SL Chart MyChart.DataContext = l.OrderBy(e => e.Value); //Find the highest number and round it up to the next digit DispatcherTimer myDispatcherTimer = new DispatcherTimer(); myDispatcherTimer.Interval = new TimeSpan(0, 0, 0, 5, 0); // 100 Milliseconds myDispatcherTimer.Tick += new EventHandler(Each_Tick); myDispatcherTimer.Start(); } public void Each_Tick(object o, EventArgs sender) { ((BarSeries)MyChart.Series[0]).DataContext = GetData(); } private IList<MyClass> GetData() { Random random = new Random(); return new List<MyClass>() { new MyClass() {Name="Bob Zero",Value=(random.NextDouble() * 100.0)}, new MyClass() {Name="Bob One",Value=(random.NextDouble() * 100.0)}, new MyClass() {Name="Bob Two",Value=(random.NextDouble() * 100.0)}, new MyClass() {Name="Bob Three",Value=(random.NextDouble() * 100.0)} }; }

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  • R is plotting labels off the page.

    - by K P
    Hi. i'm running the following: png(filename="figure.png", width=900, bg="white") barplot(c(1.1, 0.8, 0.7), horiz=TRUE, border="blue", axes=FALSE, col="darkblue") axis(2, at=1:3, lab=c("elephant", "hippo", "snorkel"), las=1, cex.axis=1.3) dev.off() and the labels on the left are appearing off the page. I can't seem to figure out how to fix it. Any ideas? Thanks.

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  • Using fft2 with reshaping for an RGB filter

    - by Mahmoud Aladdin
    I want to apply a filter on an image, for example, blurring filter [[1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0]]. Also, I'd like to use the approach that convolution in Spatial domain is equivalent to multiplication in Frequency domain. So, my algorithm will be like. Load Image. Create Filter. convert both Filter & Image to Frequency domains. multiply both. reconvert the output to Spatial Domain and that should be the required output. The following is the basic code I use, the image is loaded and displayed as cv.cvmat object. Image is a class of my creation, it has a member image which is an object of scipy.matrix and toFrequencyDomain(size = None) uses spf.fftshift(spf.fft2(self.image, size)) where spf is scipy.fftpack and dotMultiply(img) uses scipy.multiply(self.image, image) f = Image.fromMatrix([[1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0]]) lena = Image.fromFile("Test/images/lena.jpg") print lena.image.shape lenaf = lena.toFrequencyDomain(lena.image.shape) ff = f.toFrequencyDomain(lena.image.shape) lenafm = lenaf.dotMultiplyImage(ff) lenaff = lenafm.toTimeDomain() lena.display() lenaff.display() So, the previous code works pretty well, if I told OpenCV to load the image via GRAY_SCALE. However, if I let the image to be loaded in color ... lena.image.shape will be (512, 512, 3) .. so, it gives me an error when using scipy.fttpack.ftt2 saying "When given, Shape and Axes should be of same length". What I tried next was converted my filter to 3-D .. as [[[1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0]], [[1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0]], [[1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0], [1/9.0, 1/9.0, 1/9.0]]] And, not knowing what the axes argument do, I added it with random numbers as (-2, -1, -1), (-1, -1, -2), .. etc. until it gave me the correct filter output shape for the dotMultiply to work. But, of course it wasn't the correct value. Things were totally worse. My final trial, was using fft2 function on each of the components 2-D matrices, and then re-making the 3-D one, using the following code. # Spiltting the 3-D matrix to three 2-D matrices. for i, row in enumerate(self.image): r.append(list()) g.append(list()) b.append(list()) for pixel in row: r[i].append(pixel[0]) g[i].append(pixel[1]) b[i].append(pixel[2]) rfft = spf.fftshift(spf.fft2(r, size)) gfft = spf.fftshift(spf.fft2(g, size)) bfft = spf.fftshift(spf.fft2(b, size)) newImage.image = sp.asarray([[[rfft[i][j], gfft[i][j], bfft[i][j]] for j in xrange(len(rfft[i]))] for i in xrange(len(rfft))] ) return newImage Any help on what I made wrong, or how can I achieve that for both GreyScale and Coloured pictures.

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  • 3D plotting in Matlab

    - by Jill
    I'm using the subplot and then surf functions to generate images in 3D in Matlab. How do I get rid of the axes and axis' gridlines and change the color to all yellow or all green or something like that? Thanks.

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  • Web UI for inputting a function from the reals to the reals, such as a probability distribution.

    - by dreeves
    I would like a web interface for a user to describe a one-dimensional real-valued function. I'm imagining the user being presented with a blank pair of axes and they can click anywhere to create points that are thick and draggable. Double-clicking a point, let's say, makes it disappear. The actual function should be shown in real time as an interpolation of the user-supplied points. Here's what this looks like implemented in Mathematica (though of course I'm looking for something in javascript):

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