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how can I create a matrix from calculated answers
M = zeros(n); for k = 1:n % calculate y M(k,k) = y; end Or, preferably, if you can calculate all the y values in ...

15 years ago | 0

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Help regarding "format long"
Welcome to the joy of round-off error. 0.0002 is not exactly representable in binary, hence adding these floating point numbers...

15 years ago | 1

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How can I group data and plot them with unique markers for each group?
Given your description of the data and what you're trying to do with it, I'd say you really need Statistics Toolbox. Then use d...

15 years ago | 0

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How would I solve y'' = sinh(y) using finite differences?
Great, if it doesn't have to be a specific FD formulation, you can use <http://www.mathworks.com/help/matlab/ref/bvp4c.html |bvp...

15 years ago | 1

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Answered
Drawing and animation in Matlab
Doh. Too late. Still, how's this: paths = [3,3,2,1,1;1,2,1,3,2;3,3,3,2,3]; [m,n] = size(paths); th = linspace(0,...

15 years ago | 0

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find row of point in plot
Here's an interactive approach: % Make some data data = rand(10,3); otherdata = randi(5,10,3) % Plot plot3(data...

15 years ago | 0

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Answered
Matlab max array size
Technically, 25920-by-1296 is 256.3Mb, but let's not quibble over a few meg :) If you're on a Windows machine, type |memory| ...

15 years ago | 0

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Log scale graphic with negative value
Oookay, I think I have it. If you're going to do this a lot, you may want to make yourself your own function. So, see if this ...

15 years ago | 0

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Problem save
If you want ascii, why not just write out using |fprintf|? fid = fopen('a.txt','wt'); fprintf(fid,'%hd\n',a); fclose(...

15 years ago | 0

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Handling excel file
Why not import everything, then strip out any blank rows? [~,~,x] = xlsread('foo.xls'); x(all(cellfun(@isempty,x),2),:) ...

15 years ago | 0

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Estimate an expression for a Probability Density Function
By the "cumulant" function, do you mean the cumulative probability density? Because, in that case, the PDF is just the derivati...

15 years ago | 0

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fprintf in a for loop printing repetitive answers in command window
Your code is hard to read b/c of the formatting, but it seems to me that you're trying to do something very similar to <http://w...

15 years ago | 0

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How to convert my gui program to an exe file?
# Make sure you have MATLAB Compiler and a supported C compiler # Run the command |mbuild -setup| to select your C compiler # ...

15 years ago | 5

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How do I generate a given Matrix in one command?
A = full(gallery('tridiag',ones(1,4),ones(1,5),ones(1,4))) But my current favorite: A = 1-reshape(mod(floor((1:25)/3),...

15 years ago | 3

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GUI Output
As Matt Fig says, it would help to know what you're doing to get a vertical stack. Are you using |char| of a cell array of stri...

15 years ago | 0

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Multiple use of polyfit - could I get it faster?
In the manner of Jan's answer, just stripping down to a brute-force least-squares fit can give a lot of speed-up. I'm assuming ...

15 years ago | 2

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Basic Function Error (Plot Related
The operator you're looking for is |.^| (ie |x.^2|) And similarly |.*| and |./|

15 years ago | 0

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please help me in loading data to matlab
Would you be surprised if I suggested that what you really need is Statistics Toolbox? But, the brute-force way in MATLAB cou...

15 years ago | 1

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Debug this: for loop
Quick diagnostic: display the value of |P| (after it's returned by |bwlabel|)

15 years ago | 1

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please help me in loading data to matlab
BTW, best practice is to accept the answer that solved your initial question, then start a new question for the follow-up. That...

15 years ago | 1

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How do I create a varying number of outputs from a function file?
Sounds like you're looking for |varargout|. It's a cell array, with each cell holding one of the outputs. To see how many outp...

15 years ago | 0

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Log scale graphic with negative value
Richard pretty much beat me to it. Here's a slightly more automated way to get the tick marks. However, unfortunately there's ...

15 years ago | 2

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Log scale graphic with negative value
Dumb question, but is there any reason you can't just look at the absolute values? ( |abs| in MATLAB)

15 years ago | 0

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Dumb mistakes we make with MATLAB.
More in keeping with the OP, and another in the "physician heal thyself" category: [fiddling about at the command line, tryin...

15 years ago | 3

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Import Excel and plot
Run the line |[numbers,colNames] = xlsread(fileName);| from the Command Window (with the appropriate |fileName| filled in, obvio...

15 years ago | 0

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please help me in loading data to matlab
Similar to what Andrew said, but I'd go with fid = fopen('Adult.data'); A = textscan(fid,'%f%s%f%s%f%s%s%s%s%s%f%f%f%s%s,'d...

15 years ago | 2

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Saving memory by reusing a variable name?
I'd guess they'd be the same. Matrix multiply requires having to make an intermediate variable anyway (behind the scenes, if no...

15 years ago | 2

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GUI handles problem
It sounds like you're trying to refer to a local variable in a separate function. The GUI function created by GUIDE contains th...

15 years ago | 0

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Dumb mistakes we make with MATLAB.
I've been using MATLAB for 15 years or so - I teach people how to use it - and, of course, I stress the important difference bet...

15 years ago | 4

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vector to repeated matrix multiplication
Not being able to think up a more elegant solution off the top of my head, how about reshape(repmat(A(:),1,3)*(V'),2,2) Or, ...

15 years ago | 1