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• How to solve generic algebra using solver/library programmatically? Matlab, Mathematica, Wolfram etc?

  - by DevDevDev

  I'm trying to build an algebra trainer for students. I want to construct a representative problem, define constraints and relationships on the parameters, and then generate a bunch of Latex formatted problems from the representation. As an example: A specific question might be: If y < 0 and (x+3)(y-5) = 0, what is x? Answer (x = -3) I would like to encode this as a Latex formatted problem like. If $y<0$ and $(x+constant_1)(y+constant_2)=0$ what is the value of x? Answer = -constant_1 And plug into my problem solver constant_1 > 0, constant_1 < 60, constant_1 = INTEGER constant_2 < 0, constant_2 > -60, constant_2 = INTEGER Then it will randomly construct me pairs of (constant_1, constant_2) that I can feed into my Latex generator. Obviously this is an extremely simple example with no real "solving" but hopefully it gets the point across. Things I'm looking for ideally in priority order * Solve algebra problems * Definition of relationships relatively straight forward * Rich support for latex formatting (not just writing encoded strings) Thanks!

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• Distributing a function over a single dimension of an array in MATLAB?

  - by Alex Feinman

  I often find myself wanting to collapse an n-dimensional matrix across one dimension, and can't figure out if there is a concise incantation I can use to do this. For example, when parsing an image, I often want to do something like this. (Note! Illustrative example only. I know about rgb2gray for this specific case.) img = imread('whatever.jpg'); s = size(img); for i=1:s(1) for j=1:s(2) bw_img = mean(img(i,j,:)); end end I would love to express this as something like: bw = on(color, 3, @mean); or bw(:,:,1) = mean(color); Is there a short way to do this?

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• How can I implement this visual effect in MATLAB?

  - by user198729

  One can use Google's logo for a try: BTW, what's the term for it?

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• How to show graph of implicit form function using matlab?

  - by user198729

  (x-y)^2+(y-z)^2+(z-x)^2=2*r^2 Like in the above,only x,y,z are variables,how to show the graph in a general way that will also work for those doesn't have explicit form?

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• How to concatenate a number to a variable name in MATLAB?

  - by clowny

  I have a variable a = 1. I want to generate a variable name of the form: variableNumber so in this example, I would want a1 a2 a3 as variables. How can I do that?

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• How to do median filter on an indexed image using MATLAB?

  - by Runner

  medfilt2(img) doesn't take a map as parameter, so I don't think it can work well with indexed image, how do I impelemnt an median filter that can be used to process indexed images?

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• In matlab how can I calculate historical volatility of a stock?

  - by CptanPanic

  I would like to create some simulated historical options data, and need to calculate historical volatility from historical stock prices. Is there a built in function to do this? Any formulas? Thanks, CP

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• What's the best short cut for this in MATLAB?

  - by user198729

  padColor = [bgColor bgColor bgColor]; padColor = reshape(padColor,1,1,3); How to do the above in a more compact way(less code/replication)?

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• MATLAB Easiest way to assign elements of a vector to individual variables.

  - by rlbond

  So let's say I have a vector p = [1 2 3]. I want a command that looks like this: [x y z] = p; so that x = p(1), y = p(2), and z = p(3). Is there an easy way to do this?

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• What's the difference between [A,B] and [A;B] in MatLab?

  - by Runner

  % CAT(2,A,B) is the same as [A,B]. % CAT(1,A,B) is the same as [A;B]. Seems I need to know this to understand what cat does.

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• MATLAB: Can axes tick labels be accesed as text objects?

  - by yuk

  I'm curious is it possible to change text properties of tick labels independently of axes properties. Do they have handles? I'd like to control their position better, alignment, color, fonts, etc. I know I can substitute them with text labels, but it has some drawbacks. Any alternative solutions? Particularly, is it possible to put xticklabels between ticks, that are irregular? plot(1:100) set(gca,'xtick',[30 45 53 70 95]) grid on I need to put xticklabels in the middle between grids.

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• Why the valid looking statement gives error in MATLAB?

  - by user198729

  It's from this question? Why the two solutions doesn't work, though it looks very valid for me: >> t = -pi:0.1:pi; >> r = ((sin(t)*sqrt(cos(t)))*(sin(t) + (7/5))^(-1)) - 2*sin(t) + 2 ; ??? Error using ==> mtimes Inner matrix dimensions must agree. >> t = -pi:0.1:pi; >> r = ((sin(t).*sqrt(cos(t))).*(sin(t) + (7/5)).^(-1)) - 2*sin(t) + 2 ; >> plot(r,t) ??? Error using ==> plot Vectors must be the same lengths. What's wrong with the above?

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• How do you concatenate the rows of a matrix into a vector in MATLAB?

  - by jimbo

  For an m-by-m (square) array, how do you concatenate all the rows into a column vector with size m^2 ?

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• How do I maintain rows when sorting a matrix in MATLAB?

  - by Jessy

  I have a 2-by-3 matrix, and I want to sort it according to the first column. Here's an example: data will change to --> new data 11 33 10 22 22 44 11 33 10 22 22 44 I have this code for sorting a matrix A but it doesn't work well: sort(A,1,'ascend');

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• How do I save an altered image in matlab?

  - by ef-i-blinky

  So I am using the code located here: http://wwwx.cs.unc.edu/~sjguy/CompVis/Features/BlobDetect.m and I was wondering how to save the final blob detected image. The image that I am doing the blob detection on gets shown and then he manually draws the lines on the image here: Xbar = cx1+X.*cos(alpha)+Y.*sin(alpha); Ybar = cy1+Y.*cos(alpha)-X.*sin(alpha); line(Xbar', Ybar', 'Color', color, 'LineWidth', ln_wid); I then want to save this image using something like imwrite. I have been reading around and it seems that no one really has an answer to to this problem. Thanks for any help you can give me, Josh

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• how do i design a high pass filters in matlab without using the builtin function?

  - by noura

  hello everyone, i'm just not sure how to draw the frequency response (H) of the high pass filter? after drawing the frequency response i can get the b coefficient by taking the ifft of (H). so yeah, for a low pass filter, with a cutoff frequency of say pi/2 : the frequency response code will be H = exp(-1*j*w*4).*(((0 <= w) & (w<= pi/2)) | ((2*pi - pi/2 <= w) & (w<=2*pi)); sincr the response is "1" between 0 and pi/2 and between (2*pi - pi/2) and 2*pi. can you help me write H for a high pass filter? thanx in advance.

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• If a Matlab function returns a variable number of values, how can I get all of them as a cellarray,

  - by kaleidomedallion

  I am writing a function to remove some values from a cellarray, like so: function left = remove(cells, item); left = cells{cellfun(@(i) ~isequal(item, i), cells)}; But when I run this, left has only the first value, as the call to cells{} with a logical array returns all of the matching cells as separate values. How do I group these separate return values into a single cellarray? Also, perhaps there is already a way to remove a given item from a cellarray? I could not find it in the documentation.

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• Can someone explain what the output of fft means in MATLAB?

  - by Runner

  >> fft([1 4 66]) ans = 71.0000 -34.0000 +53.6936i -34.0000 -53.6936i Can someone explain according the result above?

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• How to make disconnected objects connected by adding a shortest path using MATLAB?

  - by user198729

  bwlabel can be used to get disconnected objects in an image: [L Ne] = bwlabel(image); I want to make the objects connected by adding a shortest path where necessary. How do I approach this?

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• How can I format strings for use as structure field names in MATLAB?

  - by Elpezmuerto

  I want to remove hyphens (-), slashes (/) and white space () from a string name(i) so that I can use it as a structure field name. This is the ugly way I am currently doing it using the function strrep: cell2mat(strrep(strrep(strrep(name(i), '-',''),'/',''),' ', '')) I have also tried other variations, such as: strrep(name(i),{'-','/'},{'',''}); strrep(name(i),['-','/'],['','']); What is a more efficient way of doing this?

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• Is there a way of getting a file name and inserting into Matlab script?

  - by torr

  In a folder, I have both my .m file that contains the script and an imaging .dcm file that needs to be analyzed. Folder structure: Folder1/analysis.m Folder1/meas_dynamic_123.dcm My script (analysis.m) begins as follows: target =''; <== here should go the full path to the file + filename example: /Volumes/Data/Folder1/meas_dynamic_123.m txt = dir(target); // etc So I'm wondering if there is a way of when running analysis.m it will: automatically search the folder it's in, grab the full path + filename of file containing string dynamic in the name, insert its full path + name into target variable continue running the script Does anyone have any pointers on how to achieve this? Using ffpath?

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• How to make disconnected contours connected by adding a shortest path using MATLAB?

  - by user198729

  bwlabel can be used to get disconnected objects in an image: [L Ne] = bwlabel(image); I want to make the objects(But my target is only the contours of these objects) connected by adding a shortest path where necessary. How do I approach this?

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• How to reverse the color of a bwImage in matlab?

  - by user198729

  I want to convert between the following two images:

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• How to find the shortest path between two blobs(contours/closed curves) using MATLAB?

  - by user198729

  bwlabel can be used to get disconnected objects in an image: [L Ne] = bwlabel(image); How to calculate the shortest path between two disconnected closed curves? Is there a practical(not theoretical) solution?

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• What is the best way to store a 16 × (2^20) matrix in matlab?

  - by Peter

  I am thinking of writing the data to a file. Does anyone have an example of how to write a big amount of data to a file?

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