[R] Assign Character Value to Data Frame

From: Sparks, John James <jspark4_at_uic.edu>
Date: Tue, 12 Apr 2011 13:20:30 -0500

Dear R Helpers,

I am trying to write a character value to the row of a data frame and am running into a problem that I don't have when I do this for numeric arguments. For example, the following works just fine:

> test<-data.frame(number=numeric(1))
> test[1,]<-.5
> test

1 0.5

But the following bombs out:

> hold<-data.frame(symbol=character(1))
> hold[1,]<-"NYSE:MMM"

Warning message:
In `[<-.factor`(`*tmp*`, iseq, value = "NYSE:MMM") :   invalid factor level, NAs generated

Could someone please guide me as to what adjustment I need to make to assign this character value to this row of the data frame? Your help would be very much appreciated.

--John Sparks

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