[R] "invalid argument to unary operator" while selecting rows by name

S Ellison S.Ellison at LGCGroup.com
Wed Sep 21 13:33:27 CEST 2016

> > Works like a charm, thanks! Still don't know what that error message
> > means though. Any idea?

You tried to negate a character string.

'-' can't do that.

[-x] relies on negative _numbers_ to remove elements, not on separate interpretation of '-' and 'x'.

S Ellison

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