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

Patrick Burns pburns at pburns.seanet.com
Thu Jul 7 20:02:38 CEST 2005

Maybe I have it wrong, but I think you merely want:

temp <- NA

Patrick Burns

Burns Statistics
patrick at burns-stat.com
+44 (0)20 8525 0696
(home of S Poetry and "A Guide for the Unwilling S User")

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.
>Best wishes,
>PS. I'm using dbGetQuery to query an SQLite database.
>R-help at stat.math.ethz.ch mailing list
>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

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