invalid recursive call?

[John W. Eaton]

On 28-Jul-2000, Lasse Koskinen <address@hidden> wrote:

| 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).

This problem is fixed in the current stable release, 2.0.16.
2.0.14.93 was a test release, meant for people who want to test
prerelease versions of Octave.  Why are you using it?

jwe



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