On Jun 20, 2011, at 11:47 AM, Luke Miller wrote:
If we assume that your data are in a data frame (which doesn't allow
spaces in column names, hence the periods in the call below):
df = data.frame(Major.Gleason = c(4,5,2,3), Minor.Gleason =
c(3,2,4,3))
You can paste together the contents of the two columns with a plus
sign in between using the paste() function. The sep='' option at the
end of the function call specifies that no spaces should be included
between pasted items.
output = paste(as.character(df [,'Major.Gleason']), '+',
as.character(df[ ,'Minor.Gleason']), sep='')
I do not think the as.character is needed. Coercion to character is
implicit in the use of paste(). And the sep argument could be "+".
output = paste(df [,'Major.Gleason'], df[ ,'Minor.Gleason'], sep='+')
--
David.
The new object 'output' is a character vector containing the 4 strings
you're after:
print(output)
[1] "4+3" "5+2" "2+4" "3+3"
On Mon, Jun 20, 2011 at 11:31 AM, Ben Ganzfried <ben.ganzfr...@gmail.com
> wrote:
Hi --
I had a pretty quick R question since unfortunately I have not been
able to
find an answer on Google. It shouldn't take much more than a
minute to
answer.
I'm trying to add up the major gleason grade and minor gleason
grade for an
analysis of patients with prostate cancer. One column has values
under
"Major Gleason" and another column has values under "Minor
Gleason." For
example,
Major Gleason Minor Gleason
4 3
5 2
2 4
3 3
I want my output to be:
"4+3"
"5+2"
"2+4"
"3+3"
The quasi-pseudocode in Java is basically:
major = column$majorGleason
minor = column$minorGleason
for item in len(Major Gleason) {
string s = major(item) "+" minor(item);
}
return s;
But trying the same idea in R:
string <- major "+" minor
gives me an error: "unexpected string constant in..."
I would greatly appreciate any help.
Thanks,
Ben
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--
___________________________
Luke Miller
Postdoctoral Researcher
Marine Science Center
Northeastern University
Nahant, MA
(781) 581-7370 x318
______________________________________________
R-help@r-project.org mailing list
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and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
West Hartford, CT
______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
