[R] Which - value not present

[vioravis]

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
integer(0).

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

Thank you.

Ravishankar






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