Hello,
return( list(y, x, z, dy, dx) )
# or
return( list(y=y, x=x, z=z, dy=dy, dx=dx) )
That's ONE variable returned, a list. In the first case you access the
list members by number,
ret <- dgp.par(...)
ret[[ 1 ]] # 'y' value
In the second case, by number or name.
ret[[ 4 ]]
ret[[ "dy" ]]
ret$dy
See An Introduction to R, Chapters 6 and 10, file R-intro.pdf in your
doc directory.
Hope this helps,
Rui Barradas
Em 29-07-2012 08:24, wangchi3 escreveu:
Hi!
I have some questions about R function. I try to write a function for
multi-returns. The function code is as attachment.
dgp.par<-function(ai, bi, t, n)
{
t0<-t+20
y0<-matrix(0, nr=t0, nc=n)
y0[1,]<-ai/(1-bi)
for(tt in 2:t0)
{ y0[tt,]<-ai+bi*y0[tt-1,]+rnorm(n, 0, 1) }
y<-y0[21:t0,]
x<-y0[20:t0-1,]
z<-y0[19:t0-2,]
z<-z[2:t,]
dy<-y[2:t,]-y[1:t-1,]
dx<-x[2:t,]-x[1:t-1,]
return(y, x, z, dy, dx)
}
When I execute the function I wrote, it always appears an error message that
function cannot have multi-returns. Whether the R functions only allow
single return? If the R function can allow multi-returns, how do I rewrite
my R function to allow multi-returns?
Thanks a lot.
Eric Wang
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