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• How do I do numerical integration of a vector in MATLAB?

  - by clowny

  I have a vector of 358 numbers. I'd like to make a numerical integration of this vector, but I don't know the function of this one. I found that we can use trapz or quad, but i don't really understand how to integrate without the function.

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• What are the 3 dimensions of a RHB image in MatLab?

  - by Runner

  [r,c,d] = size(rgbImage); %# Get the image dimensions What does r,c,d stand for here?

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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 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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• 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 GUI inside a function in Matlab?

  - by Paperflyer

  Is there a possibility to write a GUI from inside a function? The Problem is: The callback of all GUI-functions work in the global workspace. But functions have their own workspace and can not access variables in the global workspace. Is there a possibility to make the GUI-functions use the workspace of the function? function myvar = myfunc() myvar = true; h_fig = figure; % create a useless button uicontrol( h_fig, 'style', 'pushbutton', ... 'string', 'clickme', ... 'callback', 'myvar = false' ); % wait for the button to be pressed while myvar pause( 0.2 ); end close( h_fig ); disp( 'this will never be displayed' ); end This event-loop will run indefinitely, since the callback will not modify myvar in the function. Instead it will create a new myvar in the global workspace.

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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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• 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 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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