How can I filter the negative value?

2012 4 20
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Hello, I am a beginner at MATLAB and English, but I would like to use this tool, please give a answer.
the matrix A like below:
A = [100 -20 50 -3]
I would like to convert like below:
B = [100 0 50 0] %make 0 if a value is negative.
or
C = [10000 -20 5000 -3] % multiply 100 if value is positive.
how can I do this convertion?

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Rick Rosson
Rick Rosson 2012-4-20

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B = A.*(A>0);
C = A.*(A>0)*100 + A.*(A<0);

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