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function [M, z] = normalise(A, dim)
% NORMALISE Make the entries of a (multidimensional) array sum to 1
% [M, c] = normalise(A)
% c is the normalizing constant
%
% [M, c] = normalise(A, dim)
% If dim is specified, we normalise the specified dimension only,
% otherwise we normalise the whole array.
if nargin < 2
z = sum(A(:));
% Set any zeros to one before dividing
% This is valid, since c=0 => all i. A(i)=0 => the answer should be 0/1=0
s = z + (z==0);
M = A / s;
elseif dim==1 % normalize each column
z = sum(A);
s = z + (z==0);
%M = A ./ (d'*ones(1,size(A,1)))';
M = A ./ repmatC(s, size(A,1), 1);
else
% Keith Battocchi - v. slow because of repmat
z=sum(A,dim);
s = z + (z==0);
L=size(A,dim);
d=length(size(A));
v=ones(d,1);
v(dim)=L;
%c=repmat(s,v);
c=repmat(s,v');
M=A./c;
end
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