[R] Beginner's query - segmentation fault

[Peter Dalgaard BSA]

Laura Quinn <laura at env.leeds.ac.uk> writes:

> 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?

Not telling us which system and which version you are using, and not
giving us a reproducible example... OK, the latter can be tricky, but
does it happen all the time? Only after doing X? Also if you deal with
a subset of data? 

The command as such should work as far as I can see, and segmentation
faults should basically not happen unless the user has been messing
about at the C code level. 

(BTW, that's a data frame, not a "matrix", I assume.)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907