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Re: Integration with constants?


From: John W. Eaton
Subject: Re: Integration with constants?
Date: Sat, 11 Nov 2006 10:16:41 -0500

On 11-Nov-2006, Jens Benecke wrote:

| John W. Eaton wrote:
| 
| > On 11-Nov-2006, Jens Benecke wrote:
| > 
| > | I am trying to integrate a function that has constants previously
| > | defined in the same matlab file. Like this:
| > | 
| > | [J2, ier, nf,   err] = quad(@(x) log( ...
| > |         sqrt(1 + alpha.^2 + 2.*a.pha.*cos(2.*x)) + alpha + cos(2.*x) ),
| > |         ...
| > |                 0, pi/2, 1e-6)
| > | 
| > | "alpha" is a constant that has been calculated before. However, Octave
| > | tells me "error: alpha undefined ..."
| > | 
| > What version of Octave are you using?  This works in 2.9.9:
|  
| >   octave:1> a = 2
| >   a =  2
| >   octave:2> quad (@(x) x + a, 0, 1)
| >   ans =  2.5000
| 
| Sorry ... 2.1.72, on SuSE Linux.
| I can't upgrade because this is installed on a number of computers and we
| have created multiple custom RPMs for it (it would be a major amount of
| work).
| 
| Any way to do this with the 2.1 branch?

In that case, I think the only option is a separate function and
global variables.

jwe


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