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• Matlab: Randomize and Split

  - by Null-Hypothesis

  I have following data matrix in Matlab, I am trying to actually split this into multiple segments by passing a variable to a matlab function. But before splitting I would like to shuffle the matrix. The size of my matrix is 150X4 s.data 5.1000 3.5000 1.4000 0.2000 4.9000 3.0000 1.4000 0.2000 4.7000 3.2000 1.3000 0.2000 4.6000 3.1000 1.5000 0.2000 5.0000 3.6000 1.4000 0.2000 .. s = data: [150x4 double] labels: [150x1 double] Coming from R environment I find MatLab is very strange. Initially I thought the columns in matrix has a relationshop like in a R dataframe but thats wrong in my assumption.

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• Breaking from for loop in MATLAB GUI

  - by Nick

  I have a for loop in the opening function of a GUI in MATLAB and I'm trying to use a callback button to break the loop. I'm new to MATLAB. Here's the code I have: %In the opening function of the GUI handles.stop_now = 0; for i=1:inf if handles.stop_now==1 break; end end % Executes on button press function pushbutton_Callback(hObject, eventdata, handles) % hObject handle to end_segmenting_button (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) handles.stop_now=1; guidata(hObject, handles); For some reason, despite defining the variables with handles, the loop doesn't break upon pressing the button. Anyone know what's going on? Thanks.

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• Expectation values in MATLAB

  - by Bowler

  I have a 3D data set representing a grid of photosensors which unfortunately were not steady during use. I have estimated the pdf for the motion of the detector and I want to find the expectation value for each sensor. As I don't want to reflect my pdf (i.e. I want f(t) not f(t-tau)) I don't think I can use the matlab convolve function. Is there a function that will do what I want. I guess f I've found movavg but it seems to do something else. Also, as I'm faily new to matlab, from C, I tend to use for loops which I'm aware is not the way to use Matlab. Is there an easy way to convert my 1-D pdf to a 3D matrix that will only operate in one axis (z in this case). Something like repmat(i, j, pdf)

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• Out of Memory Matlab Error

  - by Hani

  Dears. I am using Matlab 2009b and having an out of memory error. I read other posted sol but they are not useful for me. I am sure that i am doing things right but i must use very huge amount of array sizes. I think that the problem lies beyond the fact that Matlab does not enable an array to be in more than one OS block. I am using Windows 7. Is there a way to get rid of this problem. For example can i increase the array block that Matlab uses in Windows 7? Thanks...Hani Almousli

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• How do you interchange the row and column of a matrix in MATLAB

  - by Mola

  I have an input data in Excel which has 2000 rows and 60 columns. I want to read this data into MATLAB but I need to to interchange the rows and the column so that the matrix will be 60 rows and 2000 columns. How can I do this in MATLAB, because Excel only has 256 column which cannot hold 2000 columns.

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• Open source alternative to MATLAB's fmincon function?

  - by dF

  Is there an open-source alternative to MATLAB's fmincon function for constrained linear optimization? I'm rewriting a MATLAB program to use Python / NumPy / SciPy and this is the only function I haven't found an equivalent to. A NumPy-based solution would be ideal, but any language will do.

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• Launching matlab remotely on windows via ssh? Impossible?

  - by Bob E.

  Howdy, I am trying to run matlab remotely on windows via OpenSSH installed with Cygwin, but launching matlab in windows without the GUI seems to be impossible. If i am logged in locally, I can launch matlab -nodesktop -nodisplay -r script, and matlab will launch up a stripped down GUI and do the command. However, this is impossible to do remotely via ssh, as, matlab needs to display the GUI. Does anyone have any suggestions or work arounds? Thanks, Bob

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• Plotting special function (Debye) in Matlab

  - by pizziaolo

  Hi, I'm trying to plot two functions. One is a Debye function in Matlab multiplied by some other stuff and the other is a regular function. How do I do this? Does Matlab have a toolbox for this?

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• Calculate SOM sensitivity accuracy specificity MATLAB

  - by Tim

  Hello, I just implemented a SOM algorithm in MATLAB that outputs component planes and U matrix....but i want to be able to calculate sensitivity, accuracy and specificity....how do i go about doing this in MATLAB??....any ideas or useful links would be highly appreciated??

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• Dynamically add a field to an object in matlab

  - by Marc

  Say I have a MATLAB object defined in a class file classdef foo properties bar end end And I create a foo object myfoo = foo(); Now I want to add another field to foo dynamically. What I want is foo.newfield = 42; but this will throw an error. I know there is a way to dynamically add a field/property to a MATLAB object but I can't remember it or find it easily in the help. Anyone know the syntax?

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• Small eps figure size in Matlab

  - by yCalleecharan

  Hi, How to create a small eps file from a Matlab figure. I use LaTeX and the eps that I'm getting with Matlab (R2010a) is of the order 6 MB. How to set the plot options to give an eps figure of smaller size. Does the render options painters or zbuffer help? Thanks a lot...

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• Matlab editor not using emacs shortcuts

  - by bjarkef

  Hi Is there some way I can make the matlab integrated editor not use emacs shortcut, but use more normal shortcuts such that I can press CTRL-c and CTRL-v and not be completely confused by the editor doing weird stuff? I'm using matlab on linux btw.

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• Load any file type into matlab

  - by Tim

  I have a matlab GUI....I'd like to load ANY file type(doc,txt,dat,xls) into matlab as a matrix through the GUI...I'd appreciate any help I can get!!

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• merge two binary images using Matlab

  - by Pier-alexandre Bouchard

  I need to create two different black binary rectangles using Matlab, to overlay a part of both and to extract the insertion. How can I overlay two binary images? -------|----------| | | 2 | | 1 |----|-----| | | |-----------| I created my two binary images using the false(X, Y) Matlab function. I dont find how to produce the merge the two images and to extract the insertion.

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• How to find the angle of triangle in Matlab

  - by Jessy

  I'm trying to find the angle of the the triangle in matlab. e.g. in the triangle below, I want to find the angle of ABC (marked as black). if a = 40, b=50, How I can I find the angle (in degree) of ABC in Matlab ? Thanks

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• Infrared image processing in Matlab

  - by Legent

  i would like to process infrared imaging in Matlab. Any kind of processing or techniques. Is there any built-in function in Matlab? And can anyone suggest any books or articles,as well as resources for sample Far Infrared images. Thanks!

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• Matlab Simulation

  - by iva123

  I have to make a simulation for Aircraft Cabin Pressure in Matlab. But I could not find any characteristic equation on the web. Does anyone know where to start a characteristic equation for Matlab or can anyone suggest a book for it ?

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• Compact matlab matrix indexing notation

  - by AnnaR

  I've got an nxk sized matrix, containing k numbers per row. I want to use these k number as indexes to k-dimensional matrix. Is there any compact way of doing so in matlab or must I use a for-loop? This is what I want to do (in matlab-pseudo code), but in a more matlabish way. for row=1:1:n finalTable(row) = kDimensionalMatrix(indexmatrix(row, 1),... indexmatrix(row, 2),...,indexmatrix(row, k)) end

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• Using imtophat in Matlab

  - by jaff12

  I'm trying to do top hat filtering in matlab. The imtophat function looks promising, but I have no idea how to use it. I dont have a lot of work with Matlab before. I am trying to look find basically small spots several pixels wide that are local max in my 2 dimensional array.

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• matlab and gplot

  - by JPC

  Hi, Im trying to find a way to plot a truss in matlab, i can do it by using an adjacancy matrix and the gplot function, but its very long winded approach especially if there are a lot of nodes connected to one another. Is there a faster way to do this? I'm new to matlab and the programming world any help would be really appreciated. JC

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• Thresholding in Matlab

  - by 3babala

  How do I threshold an image to find the local maxes in a robust way? I know I can just look at the data, visually guess at some appropriate h value, and do imextendedmax(I,h) where h is the threshold... but I'm looking for a more robust way to do it in Matlab. I'm pretty new to Matlab and coding so this is all foreign...

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• How can i interchange the row and column of an input data in matlab

  - by Mola

  Hi experts, i have an input data in excel which has 2000 rows and 60 columns. I want to read this data in matlab but i need to to interchange the rows and the column so that the matrix will be 2000 column and 60 rows. How can i do this in matlab, because excel only has 256 column which cannot hols 2000 column. Thanks

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• Plotting Implicit Algebraic equations in MATLAB

  - by Arkapravo

  I wish to plot implicit functions in MATLAB. Like x^3 + xy + y^2 = 36 , equations which cannot be made into simple parametric form. Is there any simple method ? I guess it is a very noob-ish question, sorry ..... have never gone exotic in MATLAB !

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• Gaussian smoothing in MatLab

  - by qpr92

  For an m x n array of elements with some noisy images, I want to perform Gaussian smoothing. How do you do that in MatLab? I've read the math involves smoothing everything with a kernel at a certain scale but have no idea how to do this in MatLab. Im pretty new to this...

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• merging and manupulating files in matlab

  - by Paul

  Is there a way to run a loop through a folder and process like 30 files for a month and give the average,max of each columns and write in one excel sheet or so?? I have 30 files of size [43200 x 30] I ran a different matlab scrip to generate them so the names are easy File_2010_04_01.xls , File_2010_04_02.xls ..... and so on I cannot merge them as each are 20mbs and matlab would crash. Any ideas? Thanks

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