try this:
lapply(split(dat, dat$country), function (x) {
pres.test(x$pop1995, x$pop2000)
})
I hope it helps.
Best,
Dimitris
Corey Sparks wrote:
Dear list,
I have the function (as a simple example, which is actually part of a
larger function)
pres.test<-function(N0=N0, N1=N1)
{
dt<
Try this:
split(mapply(function(x, y)pres.test(x, y), DF$pop1995, DF$pop2000),
DF$country)
On Wed, Oct 29, 2008 at 10:19 AM, Corey Sparks <[EMAIL PROTECTED]>wrote:
> Dear list,
> I have the function (as a simple example, which is actually part of a
> larger function)
>
> pres.test<-function(N0=N
Dear list,
I have the function (as a simple example, which is actually part of a
larger function)
pres.test<-function(N0=N0, N1=N1)
{
dt<-5
r<-log(N1/N0)/dt
r
}
which calculates the annual growth rates in a population
Where N0 is the population classified into age intervals, say
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