Please how can I unstack a column of negative and positive values into 2 columns of positive and negative values respectively?

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Nadousse28
Nadousse28 2016-7-7
评论： Nadousse28 2016-7-8
sr=[-34;45;28;-10;-9]. s=sign(sr). I want to obtain sr1=[-34;-10;-9] and sr2=[45;28]

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dpb
dpb 2016-7-7
p=sr(sr>0); % positive only
n=sr(sr<0); % negative only, you'll have to decide where zero goes if it exists...
or,
ix=sr>0; % logical vector
p=sr(ix);
n=sr(~ix); % eliminate the test once at expense of temporary variable

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Jan Orwat
Jan Orwat 2016-7-7
You can compare your data with zero. This will classify your data and you can use it to get what you want.
Example based on your example data:
sr = [-34;45;28;-10;-9];
positive = (sr >= 0);
sr1 = sr(~positive); % ~ in Matlab represents negation
sr2 = sr(positive);

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