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how to identify a 3d matrix?

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Kobi
Kobi 2014-7-1
编辑： Geoff Hayes 2014-7-1
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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the cyclist
the cyclist 2014-7-1
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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Geoff Hayes
Geoff Hayes 2014-7-1
Try ndims which returns the number of dimensions
if ndims(MAT)==3
% matrix is three dimensional
end
  2 个评论
the cyclist
the cyclist 2014-7-1
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
Geoff Hayes 2014-7-1
编辑：Geoff Hayes 2014-7-1
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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