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Multivariate piecewise function?

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• piecewise

asked 11 years ago

johnjohn
1 ●1 ●2

updated 11 years ago

Hi,

How can I define a function like this?

f(x,y) = x*y , when (x > 0),(y>0)

f(x,y) = -x*y, when (x <= 0), (y <=0)

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