Hi All

I have a data frame in which on the columns is a factor with following
levels

Levels: M006 M0114 M0379 M0432 M0823 M1012 M1096 M1107 SW393 SW708

I want to change all the M006 to "1", M0114 to "2" and so on.  What I am
trying is not working.

data1$sample[data1$sample =='M006'] <- "1"
Warning message:
In `[<-.factor`(`*tmp*`, data1$sample == "M006", value = "1") :
  invalid factor level, NAs generated


Any slick way to do this ?

Thanks!
-Abhi

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