How to use arrayfun or cellfun on m x n x o matrix where it performs operation on each m x n matrix

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Chris Knab
Chris Knab 2018-4-4
评论： Chris Knab 2018-4-4
Hi,
Please let me preface my question by stating my intent. My goal here is for work flow automation and to reduce code, not for execution speed.
I have in this case a standard RGB image which consists of an mxnxo matrix, of which o is size 3. Therefore there are 3 mxn matrices in which each represents intensity values of the respective R,G,and B channels. I wish to use array fun in this case, to return a 3 element cell array that contains the histcounts inside of each cell element for the respective channels in my image.
Another more generic way to think about this is; I want to perform a function on each mxn in my mxnxo matrix. Rather than to index each one R = (:,:,1) G = (:,:,2) B = (:,:,3)....histcounts( R ) histcounts(G) histcounts(B).
The problem I have is the syntax for this in arrayfun or cellfun. e.g. arrayfun(@histcounts,img(:,:,?))
Thanks in advance, Chris

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Matt J
Matt J 2018-4-4
编辑：Matt J 2018-4-4
out = arrayfun( @(i) histcounts(img(:,:,i)), 1:3, 'uni',0)
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Chris Knab
Chris Knab 2018-4-4
Of course, in my case I was interested in the syntax you provided as it can be used in many other scenarios I come across. I am often working in lives scripts trying to prototype some analysis and accessing data this way with less code is much cleaner.
Thanks!

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