Indexing one particular dimension regardless of number of dimensions
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Jacob Matthews
il 23 Feb 2015
Commentato: Guillaume
il 23 Feb 2015
I have a structure of several dimension (7 right now) that I will be adding dimensions to in the future. In a section of my code I need to isolate the third dimension into it's three components which right now I do like
outX = in(:,:,1,:,:,:,:); outY = in(:,:,2,:,:,:,:); outZ = in(:,:,3,:,:,:,:);
Is there a way to generalize this without having to edit the number of colons in the statement?
ex:
outX = coolFunction(in,3,1); outY = coolFunction(in,3,2); outZ = coolFunction(in,3,3);
Thanks!
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Guillaume
il 23 Feb 2015
function out = coolFunction(in, dim, page)
validateattributes(dim, {'numeric'}, {'scalar', 'positive', '<=', ndims(in)});
validateattributes(page, {'numeric'}, {'scalar', 'positive', '<=', size(in, dim)});
alldims = arrayfun(@(d) 1:d, size(in), 'UniformOutput', false);
alldims{dim} = page;
out = in(alldims{:});
end
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Guillaume
il 23 Feb 2015
Basically, it creates a cell array (with arrayfun) where each cell is an array from 1 to the size of each dimension (what colon would do), then replace the cell of the required dimension with just the page number you want in that dimension.
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