annotate l1overl2.m @ 4:e23a23349e31

Added inverse transform

function z = l1overl2(X)
%L1OVERL2 ratio between l1 and l2 norm
%
% USAGE
% z = l1overl2(x)
%
% INPUT
% x: input vector or matrix. If matrix, the function acts columnwise
% returning one value for each column.
%
% OUTPUT
% z: the ratio ||x||_1/||x||_2
%
% SEE ALSO
% NORM

% Author(s): Daniele Barchiesi
% Copyright QMUL
% $Revision: 1

nCols = size(X,2);
z = zeros(nCols,1);
for i=1:nCols
    z(i) = norm(X(:,i),1)/norm(X(:,i),2);
end

%EOF