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• How to mask part of an image in matlab ?

  - by ZaZu

  Hey guys, I would like to know how to mask part of an image that is in BLACK & WHITE ? I got an object that needs to be edge detected, but I have other white interfering objects in the background that are below the target objet ... I would like to mask the entire lower part of an image to black, how can I do that ? Thanks !!

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• Is there anything like deal() for normal MATLAB arrays?

  - by jjkparker

  When dealing with cell arrays, I can use the deal() function to assign cells to output variables, such as: [a, b, c] = deal(myCell{:}); or just: [a, b, c] = myCell{:}; I would like to do the same thing for a simple array, such as: myArray = [1, 2, 3]; [a, b, c] = deal(myArray(:)); But this doesn't work. What's the alternative?

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• Octave / Matlab: Extend a vector making it repeat itself?

  - by Tom

  Hi everyone, Is there a way to extend a vector by making it repeat itself? >v = [1 2]; >v10 = v x 5; %x represents some function. Something like "1 2" x 5 in perl Then v10 would be: >v10 1 2 1 2 1 2 1 2 1 2 This should work for the general case, not just for [1 2] Thanks in advance !

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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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• How to make disconnected closed curves 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(closed curve) of these objects) connected by adding a shortest path where necessary. How do I approach this? UPDATE Or how to dilate the closed curves so that they get connected? How to calculate the shortest path between two disconnected closed curves?

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• How do you make a 2-d array in Matlab?

  - by Ben Fossen

  I want to make a 2D array dij(i and j are subscripts). I want to be able to do dij = di,j-1+(di,j-1 - di-1,dj-1)/(4^j-1) My idea for this it to make to 1D arrays and then combine them into a 2D array. Is there an easier way to do this?

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• How to pass function to radio button in a button group created using guide in MATLAB?

  - by vijisai

  I have created a button group with four radio buttons and a push button using guide. There are four functions, one for each radio button written separately. How do you to call these functions from respective radio buttons. When a push button is pressed, the function associated with the active radio button should execute.

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• In matlab, how do I apply a function of two arguments to two cellarrays of equal length?

  - by kaleidomedallion

  So I have two cell arrays: A = {2 2 2 2} B = {[1 2] [3 2] [5 5] [7 7]} and a function of two arguments: F = @(a, b) [a * b(1), (b(2) / 3), (b(1) + a) * 22] And I want to apply the function to the two cell arrays like so: idealfun(F, A, B) and have it do the right thing (return a cell array with four cells of 1x3 vectors). Any ideas how to find/write idealfun?

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• How to create a cell array of k similar objects in Matlab?

  - by Reed Richards

  I want to create an 1,k cell of m,m matrices. I have some trouble trying to initialize it. My first idea was to do this myCell = cell{1,K}; for k = 1:K myCell{1,k} = eye(m); end But it seems like such ugly way to initialize it. There have to be a better way?

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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 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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• 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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• 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 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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• 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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• 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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• 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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• 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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• 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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• 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 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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• 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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• 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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