x<-seq(-1,1,length=10)
y<-seq(-1,1,length=10)
a<-matrix(c(1,2,2,1),2,2)
b<-matrix(c(2,1,1,2),2,2)
fv<-function(x,y) {
m<-x*a+y*b
t<-m[1,1]+m[2,2]; d<-m[1,1]*m[2,2]-m[1,2]^2
return((t-sqrt(t^2-4*d))/2)
}
gv<-function(x,y) {
t<-x*(a[1,1]+a[2,2])+y*(b[1,1]+b[2,2])
d<-(x*a[1,1]+y*b[1,1])*(x*a[2,2]+y*b[2,2])-(x*a[1,2]+y*b[1,2])^2
return((t-sqrt(t^2-4*d))/2)
}
now outer(x,y,gv) works as expected, outer(x,y,fv) bombs. But
z<-matrix(0,10,10); for (i in 1:10) for (j in 1:10) z[i,j]<-fv(x[i],y
[j])
works fine. Must be something in outer().
==========================================================
Jan de Leeuw, 11667 Steinhoff Rd, Frazier Park, CA 93225, 661-245-1725
.mac: jdeleeuw ++++++ aim: deleeuwjan ++++++ skype: j_deleeuw
homepages: http://www.cuddyvalley.org and http://gifi.stat.ucla.edu
==========================================================
A bath when you're born,
a bath when you die,
how stupid. (Issa 1763-1827)
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