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Vector algebra for arrays of any size, with array expansion enabled

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from Vector algebra for arrays of any size, with array expansion enabled by Paolo de Leva
Multiple dot, cross, and outer products, cross divisions, norms, normalizations, projections, etc.

rearrange(addlead, multiplesize, addtrail, varargin) 
function varargout = rearrange(addlead, multiplesize, addtrail, varargin)
% REARRANGE  Modifies the size of arrays
%     A = REARRANGE(addlead, multiplesize, addtrail, A)
%     rearranges array A using RESHAPE and REPMAT.
%     [A, B, ...] = REARRANGE(addlead, multiplesize, addtrail, A, B, ...)
%     rearranges arrays A, B, ... using RESHAPE and REPMAT.
%     You can add leading and trailing dimensions of any length, and you
%     can use multiples of the existing dimensions.
for i = 1: length(varargin)
    a = varargin{i};
    sizeA = size(a);    
    a = reshape(a, [ones(1,length(addlead)) sizeA]);
    a2 = repmat(a, [addlead multiplesize./sizeA addtrail]);
    varargout{i} = a2;
end

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