MATLAB Answers

Kobi
0

how to identify a 3d matrix?

Asked by Kobi
on 1 Jul 2014
Latest activity Edited by Geoff Hayes
on 1 Jul 2014
by using the function:
MAT=imread('image.jpg');
sometimes (if the image isn't in grayscale) i get output of 3D matrix (RGB) is there any function or a technic i can use?

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Sara
on 1 Jul 2014
Can use to do what?

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2 Answers

Answer by the cyclist
on 1 Jul 2014
 Accepted Answer

numel(size(MAT))>=3
will be true for an array of dimension 3 or greater.
Note that this will not discriminate between objects of dimension 1 and 2, because of how MATLAB stores scalars as vectors of length 1 (and therefore have size 1x1).

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Answer by Geoff Hayes
on 1 Jul 2014

Try ndims which returns the number of dimensions
if ndims(MAT)==3
% matrix is three dimensional
end

  2 Comments

the cyclist
on 1 Jul 2014
I didn't know about this command, which is a cleaner version of what I did more manually. Note that it suffers from the same weakness about not being able to discriminate between objects of dimension 1 and 2.
Geoff Hayes
on 1 Jul 2014
That's true. You could use isvector to discriminate between objections of dimension 1 and 2.
I suppose even ismatrix could be used to determine if the object has at most two dimensions (and so ~ismatrix(MAT) would be true for a 3D image).

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