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mpw06a
2010 Jan 03
1
calculations on columns with partially matching names
Is there a command for partial matching of character strings? Specifically,
I'd like to be able to calculate the mean of the values in any columns in a
data frame or matrix that have identity in part of their column names. For
example, columns labeled "mpw06a" and "mpw06b" match on the first five
characters; their mean would be taken whereas any columns beginning with
other than "mpw06" would be excluded. I need to compare every pair of
columns in the frame, and in some cases, possibly three at a time.
Thanks in advance for any ideas.
Jim Bould...