find_first_change.m

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function Y = find_first_change(X)
%
% Example
%>> input = X =
%>>    0 0 0
%>>    1 0 0
%>>    0 0 1
%>>    1 0 1
%>> output = Y = [2 -1 3]

%Yasushi KONDOH <[e-mail]>
n = size( X, 1 );  Y = n - sum( cumsum(X) > 0  ) + 1;  Y( Y > n ) = -1;