I have two data frames like so
> qpiso
iso requests
1 A1 20
2 A2 199
3 AD 5
4 AE 176
...
189 ZW 82
> qplegit
iso requests
1 A2 36
2 AE 4
3 AM 2
4 AO 1
...
100 ZW 3
I want to create another dataframe qpspam which contains all pairs
from pqiso with the values for requests of qplegit being subtracted
from those which exist in qpiso,
ie
iso requests
1 A1 20
2 A2 163
3 AD 5
4 AE 172
...
189 ZW 79
but don't know how to do this, and google isn't too helpful.
As usual, a solution is preferred, but a pointer to where I can
read this up is equally appreciated :-)-O
el
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