On 8/02/2010 2:08 PM, David Winsemius wrote:
On Feb 7, 2010, at 8:26 PM, Nathan S. Watson-Haigh wrote:
I have a 2 column data.frame:
d[1:5,]
a b
1 80015 C
2 80016 B
3 80023 C
4 80062 B
5 80069 B
I want to apply a function across each row:
for(i in 1:nrow(d)) {
+ myFun(con, d[i,]$a, d[i,]$b)
+ }
How do I do this using apply()? I'm unsure how to tell apply() to
pass data from columns a and b for a given row as arguments to the
function myFun().
apply(d, 1, function(x) myFun(x[1], x[2]) )
The reason you cannot use the "$" operator is that the row is passed
to the function as a vector, rather than as a list.
Thanks for the info, it was ever so slightly out......But for anyone
else who might read this, the full working code of my example was as
follows:
apply(d, 1, function(x) myFun(con, x[1], x[2]))
Cheers,
Nathan
--------------------------------------------------------
Dr. Nathan S. Watson-Haigh
OCE Post Doctoral Fellow
CSIRO Livestock Industries
University Drive
Townsville, QLD 4810
Australia
Tel: +61 (0)7 4753 8548
Fax: +61 (0)7 4753 8600
Web: http://www.csiro.au/people/Nathan.Watson-Haigh.html
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