[R] which() with multiple conditions

pdb philb at philbrierley.com
Mon Oct 1 14:02:11 CEST 2012

I hope someone can point me in the right direction please.

I have a data frame with a column containing names.  I want to identify the
columns that contain names in a list.

namestofind <- c('fred','bill',....a long list)

If I only wanted to identify a single name I would use

which(z$name == 'bill')

What syntax would I use to identify all the rows that contain any of the
names in namestofind?

Thanks in advance for the pointer

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