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How to make NaN data

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hj lee
hj lee 2020-6-11
评论： hj lee 2020-6-12
Hello,
here is the data.
a = [-2 -1 2 3]
b = [1 2 3 4]
c=a.*b
c = [-2 -2 6 12]
right?
but I want to make the NaN value to the negative c data..
in this case, c = [NaN NaN 6 12]
How to do that?
values of b can vary depending on my initial condition, so I need the code which change to NaN automatically.

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madhan ravi
madhan ravi 2020-6-11
c(c<0) = NaN

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