I cannot explain the segmentation fault but try this instead (which
works for matrices)
temp[which(temp==-999, arr.ind=T)] <- NA
No! Please *do* use is.na()<- !!!
Uwe Ligges
Are you sure temp is matrix and not a dataframe ? Use class(temp) to find out.
Also, if you are getting these "-999.00" because you have read files containing them, it might just be easier to code the missing values when reading in. Try read.table( file="lala.txt", na.strings = "-999.00").
--
Adaikalavan Ramasamy
-----Original Message-----
From: Laura Quinn [mailto:[EMAIL PROTECTED] Sent: Tuesday, October 07, 2003 8:04 PM
To: [EMAIL PROTECTED]
Subject: [R] Beginner's query - segmentation fault
I am dealing with a huge matrix in R (20 columns, 54000 rows) and have lots of missing values within the dataset which are currently displayed as the value "-999.00" I am trying to create a new matrix (or change the existing one) to display these values as "NA" so that I can then perform the necessary analysis on the columns within the matrix.
The matrix name is temp and the column names are t1 to t20 inclusive.
I have tried the following command:
temp$t1[temp$t1 == -999.00] <- NA
and it returns a segmentation fault, can someone tell me what I am doing wrong?
Thanks Laura
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