MATLAB: Read the size of cell array with the same element

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Hi I have a cell array looks like follows. How could I read the size of the cell array has the same element? In this case, I have 6 rows of 01.jpg so the first one is 6. I have 2 rows of 04.jpg so the second one is 2 and so forth. Thanks for your help!

%
01,jpg
01,jpg
01,jpg
01,jpg
01,jpg
01,jpg
04,jpg
04,jpg
05,jpg
05,jpg
...

Best Answer

Please use valid matlab syntax in your question, so it's not ambiguous. Assuming that your cell array is of the form:

c = {'01,jpg'  
     '01,jpg'
     '01,jpg'
     '01,jpg'
     '01,jpg'
     '01,jpg'
     '04,jpg'
     '04,jpg'
     '05,jpg'
     '05,jpg'}

This would work:

 [~, ~, id] = unique(c, 'stable');
 sequencelengths = diff(find(diff([-Inf; id; Inf])))

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MATLAB: Renaming values in an array

You can use unique to achieve this:

>> [~,~,ic] = unique(B,'rows')
ic =
   1
   1
   1
   1
   2
   2
   2
   3
   3
   4
   5
...

Note that this method works only if the rows of B occur in the order of the pattern that you specify.

MATLAB: Get in Order respond when using “eig” command

To sort the eigenvalues to be increasing in magnitude, use the following:

[U, d] = eig(k, m, 'vector');
[d, ind] = sort(d);
U = U(:, ind);

The eig function doesn't sort the eigenvalues it returns, for two reasons:

1) This is not needed for many applications, and would slow down the computation time for these cases. 2) For non-symmetric eigenvalue problems, the eigenvalues are complex, and none of the sorting methods for complex values are very satisfactory.

For symmetric problems (for the generalized case, this means both matrices are symmetric, and the second matrix is also positive definite), the eigenvalues are typically returned in ascending order by eig, but this is not a guarantee.

Best Answer

Related Solutions

MATLAB: Renaming values in an array

MATLAB: Get in Order respond when using “eig” command

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