Hi,
I have a vector f with some negative columns. I remember that there is
an easy expression that can find out negative items. Can someone tell me
how I can do it?
It seems to be
f[i such that f[i]<0 ...]
Thanks,
Miao
> d<-1:7
> f<-(-2)^d
> f
[1] -2 4 -8 16 -32 64 -128
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