Re: [R] xmat[1, 2:3] <- NULL

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Fri 08 Jul 2005 - 03:43:31 EST

Mikkel Grum wrote:

> I have a situation where I'm filling out a dataframe
> from a database. Sometimes the database query doesn't
> get anything, so I end up trying to place NULL in the
> dataframe like below.
>
>

>>temp <- NULL
>>xmat <- as.data.frame(matrix(NA, 2, 3))
>>xmat[1, 2:3] <- temp

>
> Error in if (m < n * p && (n * p)%%m)
> stop(gettextf("replacement has %d items, need %d", :
> missing value where TRUE/FALSE needed
>
> I can't get the programme to accept that sometimes
> what the query looks for just doesn't exist, and I
> just want to move on to the next calculation leaving
> the dataframe with a missing value in the given cell.
> It's a real show stopper and I haven't found a way
> round it.

See ?try

Uwe Ligges

> Best wishes,
> Mikkel
>
> PS. I'm using dbGetQuery to query an SQLite database.
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jul 08 03:50:52 2005

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