Hi,

I'm trying to replace all values equal to 1 in one file (a) with the value
in the corresponding column in a separate file (b). Example below. 
Any help (and brief notes if poss) much appreciated. Thanks!!

file a:
0,0,1,1,0
1,0,0,0,1
0,0,0,0,0
1,0,1,1,0

file b:
3,4,6,8,11

output request:
0,0,6,8,0
3,0,0,0,11
0,0,0,0,0
3,0,6,8,0



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