[R] Which - value not present

vioravis vioravis at gmail.com
Wed Nov 10 03:55:35 CET 2010

I am trying to use which function to obtain the index of a value in a
dataframe. Depending on whether the value is present in the dataframe or not
I am performing further operations to the dataframe.

However, if the value is not present in the dataframe, I am getting an

How do I check for integer(0)? something like is.na???

Thank you.


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