On 04/07/09 18:56, Mark Kimpel wrote:
I am using grep to locate colnames to automate a report build and have
run into a problem when a colname is not found. The use of integer(0)
in a conditional statement seems to be a no no as it has length 0.
Below is a self-contained trivial example. I would like to get
something like "NA" or -1 for the position when it is not found OR
learn a way to use integer(0) or some "cast" of it in a logical
statement. Example, output, and sessionInfo follow. Thanks, Mark
####################################3
vec.1<- c("a", "b", "c")
vec.2<- c("a", "c", "d")
for (i in 1:length(vec.1)){
for (j in 1:length(vec.2)){
print(paste("i:", i, " j:", j, sep = ""))
pos<- grep(vec.1[i], vec.2[j])
if (pos> 0){
Try: if ( length(pos) > 0 ) {
Allan.
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