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31244
2008 Apr 19
1
Regular Expressions Help
I am having some trouble learning regular expressions. Let me describe
the general problem I am dealing with. Consider the following setup:
Joe<- c(1,2,3)
Bob<- c(2,4,6)
Alice <- c(9,8,7)
Matrix <- cbind(Joe, Bob, Alice)
St <- c("Bob", "Alice", "Alice:Bob")
Now I want to make a new matrix having only the column's listed in St
that were in Matrix