I have two different data frames ( actually a set of data frames for each
class and one master one into which i want pull some data from each of the
frame in the set)
 one  is all students that have taken a course

so the set of data frames is
B101
B2A
B2B
B2C
etc. . .


and each one has lots of data e.g.
B101
SID     zGRADE
444     -.2
458      0
587      .2
etc

and
Master
SID
 587
etc

and I would like  to make a field in master for each data frame
e.g. Master$B101, Master$B2A
and populate it with the zGrades from each of the data frames

the SID in Master are a  wholely containted sub set of the ones in each of
the other data frames

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