i have a column matrix [23; 34;22;13]. i need to create set of column matrixs ,which give 1 and -1 in numbers if the next number is less than and larger than.

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shashika iresh
shashika iresh 2016-10-2
评论： shashika iresh 2016-10-4
A=[23; 34;22;13] output matrixs=[1;-1;-1],[-1,-1],[-1]

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Guillaume
Guillaume 2016-10-2
One possibility:
A = [23; 34; 22; 13];
out = arrayfun(@(idx) sign(A(idx+1:end) - A(idx)), 1:numel(A)-1, 'UniformOutput', false)
celldisp(out)
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Atsushi Ueno
Atsushi Ueno 2016-10-2
编辑：Atsushi Ueno 2016-10-3
I have modified the last answer after getting your comment.
A = [23; 34; 22; 13];
B = sign(diff(A));
matrixs = {0};
for i = numel(B):-1:1
matrixs = {B(i:end), matrixs{:}};
end

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