Hello:
How can I interchange symbols for numeric values in a data frame.
> test
f s t
1 a 1 -1
2 b 1 -3
3 c -1 1
say I have test d.f . I want to make flip number that are positive to
negative and negative to positive only for numerics in column 's'
my desired result:
> new.test
f s t
1 a -1 -1
2 b -1 -3
3 c 1 1
thanks
Adrian
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