Deciphering an Error message

2012 4 2
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What does the following error message mean?
??? Index exceeds matrix dimensions.
Error in ==> clabel>inline_labels at 172
    if strcmp(get(h(1), 'Type'), 'patch') && ~strcmp(get(h(1), 'FaceColor'),
    'none')
Error in ==> clabel at 111
                    h = inline_labels(cax, cs, varargin{:});
Thank you.

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Walter Roberson
Walter Roberson 2012-4-2

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Brooke, for some values of n, there would be no data below the choosen n, and so there would be no contour line drawn. The handle returned, h, would be empty. Feeding an empty handle to clabel causes the message you see.

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Sean de Wolski
Sean de Wolski 2012-4-2

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x = rand(2,2)
x is now a 2x2 matrix.
If I try to get x(3,3):
x(3,3)
I'll get that error because x(3,3) doesn't exist since it's 2x2

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Brooke
Brooke 2012-4-2
Thanks, Sean, but What I have written is
x = linspace(…,…,…);
y = linspace(…,…,…);
[x,y] = meshgrid(x,y);
z = ...;
n = input('Enter n: ');
m = [n,n];
[c,h] = contourf(x,y,z,m);
clabel(c,h)
for some values of n, the program works fine but for others the error message above is presented.
I don't understNd what's wrong :(
Sean de Wolski
Sean de Wolski 2012-4-2
What are you entering for n?
Brooke
Brooke 2012-4-2
It works when I enter say 1, 0.2, 0,5 etc but stops working when I entered anything greater than 3 (or maybe some tighter bound)...

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