From help-request at octave dot org Sat Aug 20 04:24:51 2005 Subject: Re: integral; changed to quad example From: Marek Szczypinski To: "Henry F. Mollet" Cc: "Fred J." , Octave_post Date: Sat, 20 Aug 2005 11:16:59 +0200 (CEST) My guess is that You are using function which operates on vectors and in the manual: (about function one want to integrate)... It must have the form y = f (x) where y and x are scalars Maybe it is the problem. The ABNORMAL RETURN FROM DQAGP seems to be a message from inside of the fortran subroutine DQAGP which is used by quad. Hope this helps. Marek Homo sum, humani nihil a me alienum puto. On Fri, 19 Aug 2005, Henry F. Mollet wrote: > GNU Octave, version 2.1.71 (powerpc-apple-darwin8.1.0). > Example for using quad is given below. Results as given in the example but > what is ABNORMAL RETURN FROM DQAGP? > Henry > > octave:10> function y = f (x) >> y = x .* sin (1 ./ x) .* sqrt (abs (1 - x)); >> endfunction > octave:11> [v, ier, nfun, err] = quad ("f", 0, 3) > ABNORMAL RETURN FROM DQAGP > v = 1.9819 > ier = 1 > nfun = 5061 > err = 1.1522e-07 > > > > on 8/19/05 2:01 AM, Marek Szczypinski at markacy at astri dot uni dot torun dot pl wrote: > >> Hi, >> Try: >> http://www.octave.org/doc/Functions-of-One-Variable.html >> maybe this will help >> Marek >> >> Homo sum, humani nihil a me alienum puto. >> >> On Thu, 18 Aug 2005, Fred J. wrote: >> >>> Hello >>> >>> I need to do an integration >>> >>> integrate_0^(x-1/2) integrate_(1/2+y)^0 12xy(1-y) dx >>> dy >>> >>> how can I use octave to do this. I have been reading a >>> lot in the >>> first few pages of the manual but need to know if this >>> is even do-able >>> with octave? >>> >>> thanks >>> >>> >>> >>> ____________________________________________________ >>> Start your day with Yahoo! - make it your home page >>> http://www.yahoo.com/r/hs >>> >>> >>> >>> >>> ------------------------------------------------------------- >>> Octave is freely available under the terms of the GNU GPL. >>> >>> Octave's home on the web: http://www.octave.org >>> How to fund new projects: http://www.octave.org/funding.html >>> Subscription information: http://www.octave.org/archive.html >>> ------------------------------------------------------------- >>> >> >> >> >> ------------------------------------------------------------- >> Octave is freely available under the terms of the GNU GPL. >> >> Octave's home on the web: http://www.octave.org >> How to fund new projects: http://www.octave.org/funding.html >> Subscription information: http://www.octave.org/archive.html >> ------------------------------------------------------------- >> > > > > > ------------------------------------------------------------- > Octave is freely available under the terms of the GNU GPL. > > Octave's home on the web: http://www.octave.org > How to fund new projects: http://www.octave.org/funding.html > Subscription information: http://www.octave.org/archive.html > ------------------------------------------------------------- > ------------------------------------------------------------- Octave is freely available under the terms of the GNU GPL. Octave's home on the web: http://www.octave.org How to fund new projects: http://www.octave.org/funding.html Subscription information: http://www.octave.org/archive.html -------------------------------------------------------------