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Subscript indices must either be real positive integers or logicals.
In that line you are indexing k and a as if they were variables. you need to insert a * in two spots. You have 'a(' instead of...

environ 13 ans il y a | 1

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Plots Stacking when it is unwanted.
Your description of the problem is not clear. Do you want to put a: hold off as the last line of this section of code?

environ 13 ans il y a | 0

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How can I make a for loop with two diferent indexes
syms w; cnt = 1:.2:20; for ii=1:length(cnt) xi = fsolve(@(w) -tan(w/2) + w/2-4/ii*(w/2).^3,[1 3]*pi-.1); ...

environ 13 ans il y a | 0

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code without for loop
idx = sub2ind(size(mask),index(:,1),index(:,2)); mask(idx) = 255;

environ 13 ans il y a | 0

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Adding a title to a graph
title(sprintf('Beam %s Beam \n%6.2f lb. applied to a %s %s'... ,'gold',200,'joist','pooter'),'fontweight','b'); This w...

environ 13 ans il y a | 0

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store string in array
What do you mean the INPUT function only lets you input one character? >> G = input('Enter a string: ','s') Enter a ...

environ 13 ans il y a | 0

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Is it possible to use exist function in a loop?
Did you try it? The help for EXIST indicates you can use it as you are doing.

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How to copy XTickLabels?
xticlabel is not a child of the axes, it is a property of the axes. f1=figure; ax1=axes; plot(data); set(gca,...

environ 13 ans il y a | 0

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random permutation of 3 numbers when repetition of digits are allowed
Give this file a try: <http://www.mathworks.com/matlabcentral/fileexchange/11462-npermutek NPERMUTEK>. It solves the general pr...

environ 13 ans il y a | 1

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How to populate a listbox from a pop up menu
Set the string property. set(handles.listbox1, 'string','Restaurant')

environ 13 ans il y a | 0

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Plotting a Piecewise function?
First define this in an M-file: function [F] = myfunc(thet) % help F = zeros(size(thet)); idx = -pi/2 <= thet & th...

environ 13 ans il y a | 0

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What is the difference between exp and expm in terms of a matrix ?
<http://www.mathworks.com/help/matlab/ref/expm.html EXPM Documentation> If you look at that link, the difference is explained...

environ 13 ans il y a | 0

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index of a mnatrix to negative
No. MATLAB has the first index as 1.

environ 13 ans il y a | 0

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Generating A(i,j) = [i; j]
You want each element of your matrix to be a two element vector? That is not a matrix, but it does sound like a cell array. ...

environ 13 ans il y a | 0

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Vector imbalance error in while loop
You may have meant: y1(i) = (F.*x(i).^2/6*E*I).*(3*a-x(i)); % 0<x<a Otherwise you are trying to put numel(x) elemen...

environ 13 ans il y a | 0

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I'm getting a plotting length mismatch error but my lengths match
You are calling PLOT incorrectly. PLOT only takes the variables to be plotted and lineseries properties, not axes properties. ...

environ 13 ans il y a | 1

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element wise multiplication and sum
I don't know where the 15 came from. I assume you mean 12. >> a = [1,2,3;4,5,6]; >> b = [2,2,2]; >> a*b.' % same...

environ 13 ans il y a | 2

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Error: Attempted to access x(101); index out of bounds because numel(x)=100.
You want 0 < x(i) && x(i) < a Your expressuon evaluates to: 1 < a Because MATLAB evaluates from left to right....

environ 13 ans il y a | 0

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finding index of several values within a vector efficiently
idx = [1 2 5]; X = [1 5 4 3 2]; vals = X(idx) % linear indexing.

environ 13 ans il y a | 0

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how to create 2 matrices from 1 matrix depending on values 0 & 1, displayed in first column of 1st matrix?
Now I think I see what you did. You probably did not realize that the | symbol evaluates to logical OR when someone copies and ...

environ 13 ans il y a | 0

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what's the relation between a resolution and the size of pixel?
Sounds like it. Resolution is how many pixels per unit linear measure, so in the U.S. we would say 1/pixelsize = 1/(.254) =...

environ 13 ans il y a | 0

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Why/How does MATLAB run faster when the workspace is full of variables?
I would be willing to bet that reason you experience the speed increase is that when you issue the CLEAR command you are not onl...

environ 13 ans il y a | 2

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GUI Program Crash on .fig Load
More details may be necessary. Did you make all of the changes through GUIDE? Did you save them as you went (change-save-check...

environ 13 ans il y a | 0

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Can anyone help me to get this PV=nRT working? please.
Change your FOR loop to this: for jj=1:length(V) % Note, length(V), not 10! P1(jj)=T1*R*n/V(jj); P2(jj)=T...

environ 13 ans il y a | 1

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In an assignment A(I) = B, the number of elements in B and I must be the same.
Have a look at this: A([1 2 3]) = [8 7 6 8 7 9] % Error A([1 2 3]) = [8 7] % Error A([1 2 3]) = [8 7 6] % No error ...

environ 13 ans il y a | 0

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Unexpected result for sin()
In general, you need to make your sample frequency sensitive to the signal frequency... (Nyquist) f = 50; x = 0:0.1/(...

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Output of the row of a vector which has the same entry as a second vector
You were close, but you want to switch the order of the arguments to ISMEMBER and use the two output call. % Original data ...

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Fitting N(N-1) points on an NxN matrix
% Say your given vector is: X = [ 2 3 4 5 6 7 ]; % Now to make the matrix. L = (1 + sqrt(1+4*length(X)))/2; F = ...

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GUI data sharing problem?
Put the call to UIGETFILE in the callback for the pushbutton. Then immediately after the return, simply use the open the file a...

environ 13 ans il y a | 0

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In plotting Y(x)=10^x, for x=0:5 matlab gives y-axis tick labels as 0 1 2 3 4 and last as 5 x 10^5. How can I get all tick labels as 10^x?
You could use the MATLAB logarithmic plotting routines: x = 0:5; semilogy(x,10.^x) % Also, see SEMILOGX, LOLOG

environ 13 ans il y a | 0