How to turn an 1x1x3 array to a 1x3 vector?

Asked by Z Yerby on 21 Jun 2019

Latest activity Commented on by Z Yerby on 24 Jun 2019

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Various manipulations I perform in my script create a 1x1x3 array which I then need to produce a dot product with a 1x3 vector. That's not playing together so I need to turn my 1x1x3 array into a 1x3 vector. I figure I can use vector=[array(1,1,1), array(1,1,2), array(1,1,3) ]; but I don't like how that looks and figure I could cut a line out if there was a function call that does the same thing. I assume there is one because this seems like something an existing function call would do but I cannot find it. Is there something I could use instead of vector=[array(1,1,1), array(1,1,2), array(1,1,3) ];?

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Star Strider on 21 Jun 2019

Perhaps squeeze?

2 Answers

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Answer by madhan ravi on 21 Jun 2019

Edited by madhan ravi on 21 Jun 2019

Accepted Answer

reshape(array,1,[]) % or squeeze() transposed

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Z Yerby on 24 Jun 2019

I ended up using squeeze and it worked for my purposes well. Thanks.

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Answer by Bruce Elliott on 21 Jun 2019

Yes, there is an existing function to do that: permute().

Here's the help text:

%  permute Permute array dimensions.
%     B = permute(A,ORDER) rearranges the dimensions of A so that they are in
%     the order specified by the vector ORDER.  The resulting array has the
%     same values as A but the order of the subscripts needed to access any
%     particular element is rearranged as specified by ORDER.  For an N-D
%     array A, numel(ORDER)>=ndims(A).  All the elements of ORDER must be
%     unique.
%   
%     permute and IPERMUTE are a generalization of transpose (.') 
%     for N-D arrays.
%  
%     Example:
%        a = rand(1,2,3,4);
%        size(permute(a,[3 2 1 4])) % now it's 3-by-2-by-1-by-4.
%  
%     See also ipermute, circshift, size.

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