Double integration results in "error: quad: invalid recursive call"

[Timo Steffens]

Hello,

I am trying to compute a double integration with octave. Since I am 
migrating from "Mathematica", maybe I am thinking wrong. In Mathematica I'd 
do
NIntegrate[NIntegrate[d1*d2, {d1, 0, 10}], {d2, 0, 10}]



In Octave I tried the following:

> > function y = myfunc(d1)
y=d1*d2
endfunction
> > function y = firstint(d2)
[y,ier,nfun,err] = quad('myfunc',0,10)
endfunction
> > [result,ier,nfun,err] = quad('firstint',0,10)
error: quad: invalid recursive call
error: called from `firstint'
error: quad: evaluation of user-supplied function failed



I am using version 2.1.50 for windows. I read in the archives that the error 
for calling quad more than once has been fixed in 2.0.16

I couldn't find information about this behavior in the documentation or the 
mailing list archives...So is it a bug or am I doing something wrong?



Thanks!
Timo Steffens
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