About warnings for non-matched items

Richard Cotton · 2009-03-06T13:53:22Z

> I have many files in my directory. I want to transfer each data into > one which is readable. > They have so many possibilities, i have collected(manually and > visually) all possibilities and represent them as different numbers. > > Rep[grep('context_log',log1$Remain[1:length(log1$Date)]),] Rep[grep('gs',log1$Remain[1:length(log1$Date)]),] Rep[grep('ClockApp',log1$Remain[1:length(log1$Date)]),] Rep[grep('mce',log1$Remain[1:length(log1$Date)]),] ...... > I manuall

Richard Cotton

Fri, Mar 6, 2009 5:53 AM

The error means that the input you provided to the max function is missing 
or NULL or of length 0.  At a guess, what has happened is that you've 
called grep, which didn't match anything (and so returned integer(0)), 
then used that as an input to max.

To get rid of the warning, check the input to max first.  e.g.

x1 <- c("foo", "bar", "foo")
g1 <- grep("foo", x1)
if(length(g1)) max(g1)

g2 <- grep("baz", x1)
if(length(g2)) max(g1)

Regards,
Richie.

Mathematical Sciences Unit
HSL



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About warnings for non-matched items

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