Hi, I ran into a problem when I complied a dataset with UTM coordinates.
For calculating distances between sites, I need to reformat the
coordinates from, for example,
32?35.421 N, to 35.421, i.e. I need to delete all digits before symbol ?
and a space and N at the end of the string. What
Hi Weidong,
It works, but I'm completely sure could be more efficient:
# x is a string
DELETE=function(x){
x=as.character(x)
res=NULL; for(i in 1:nchar(x)) res=c(res,substr(x,i,i))
pos=which(res==?|res== ) # Detecting ? and
res2=res[(pos[1]+1):(pos[2]-1)]
k=length(res2)
res3=NULL; for(i in
Weidong Gu wrote:
Hi, I ran into a problem when I complied a dataset with UTM coordinates.
For calculating distances between sites, I need to reformat the
coordinates from, for example,
32?35.421 N, to 35.421, i.e. I need to delete all digits before symbol ?
and a space and N at the end
Match the start (^) followed by anything (.*)
to the question mark ([?]) or (|) a space ( ) followed
by anything (.*) to the end ($) and replace each
of those with nothing ().
gsub(^.*[?]| .*$, , 32?35.421 N)
On Feb 8, 2008 3:36 PM, Weidong Gu [EMAIL PROTECTED] wrote:
Hi, I ran into a problem
This should do it for you:
x
[1] 32?35.421 N
sub(^.*?([[:digit:].]+) N, \\1, x, perl=TRUE)
[1] 35.421
On 2/8/08, Weidong Gu [EMAIL PROTECTED] wrote:
Hi, I ran into a problem when I complied a dataset with UTM coordinates.
For calculating distances between sites, I need to reformat the
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