On 11-05-07 4:06 AM, Dan Abner wrote:
Hello everyone,
I have the following R code for a multivariable function:
fn2<-function(x,y,z){(y+2*z)/(5*y-x*z)}
fn2(-5,-2,3)
[1] 0.8
No problems.
===
If, however, I call the function using a vector substitution for the
arguments, R sees this as 3 separate calls to the function while supplying
only the first argument:
in2<-c(-5,-2,3)
in2
[1] -5 -2 3
fn2(in2)
Error in fn2(in2) : argument "y" is missing, with no default
===
How should I call the function using the vector substitution method so that
R sees that this is a single call to the function that supplies all 3 of the
arguments?
The simplest way is to write a new wrapper function:
fn3 <- function(xyz) fn2(xyz[1], xyz[2], xyz[3])
You can also do it with do.call:
do.call(fn2, as.list(in2))
Duncan Murdoch
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