Multivariate piecewise function?

asked 2013-08-23 04:36:21 -0600

johnjohn gravatar image

updated 2013-08-23 04:36:58 -0600

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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