invalid recursive call?

[Lasse Koskinen]

Dear Friend,

I just would like to know why the following happens:
++++++++++++++++++++++++++++++++++++
$ octave
GNU Octave, version 2.0.14.93 (i386-pc-linux-gnu).
Copyright (C) 1996, 1997, 1998, 1999 John W. Eaton.
This is free software with ABSOLUTELY NO WARRANTY.
For details, type `warranty'.

octave:1> function y = f (x)
>   y = x .* sin (1 ./ x) .* sqrt (abs (1 - x));
> endfunction
octave:2> [v, ier, nfun, err] = quad ("f", 0, 3)
v = 1.9819

ier = 1

nfun = 5061

err =  1.1522e-07

octave:3>
++++++++++++++++++++++++++++++++++++++

Yes, this is the example found in the manual. Now, if I invoke "quad" 
again, happens that

++++++++++++++++++++++++++++++++++++++
octave:3> [v, ier, nfun, err] = quad ("f", 0, 3)
error: quad: invalid recursive call
error: evaluating index expression near line 4, column 23
error: evaluating assignment expression near line 4, column 21
octave:4>
++++++++++++++++++++++++++++++++++++++

In other other words, the first calculation of quadrature worked fine but 
the second came out with an error message. I noticed this always happens 
with "quad", the function itself doesn't matter: you only can do it once 
and then you have to restart Octave in order to use it again. What do you 
think?

The version I tried is  GNU Octave, version 2.0.14.93 (i386-pc-linux-gnu).

Sincerely,

Lasse Koskinen



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