so I have a partially empty dataframe and I need to assign values to a vector that we may call "C" based on different outcomes of an other vector which we may call B. The values to assign to C are taken, in some determined cases, from a third vector, "A". How can I do that? I tried if statements and for loops but don't know how to do them properly. Here's summarized my problem. Thank you for your answers
A = (1,2,3,4,5,6,7,8,9,10)
B = (1,0,1,2,1,0,0,2,0,1)
C = 0 if B = 0
=A(same row) if B = 1
=-A(same row) if B =-1
An option is to get the sign
of 'B' and multiply with 'A'
C <- sign(B) * A
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