Difference between area under curve and integrate

Done.

-----Original Message----- 
From: Barton Willis
Sent: Monday, January 09, 2012 8:14 AM
To: rich.hennessy at verizon.net
Cc: maxima at math.utexas.edu
Subject: Re: [Maxima] Difference between area under curve and integrate

This is a abs_integrate bug; if you report it, I'll try to fix it.

--Barton

-----maxima-bounces at math.utexas.edu wrote: -----
To: "Maxima List" <maxima at math.utexas.edu>
From: "Richard Hennessy"
Sent by: maxima-bounces at math.utexas.edu
Date: 01/08/2012 08:35PM
Subject: Difference between area under curve and integrate




Hi list,

Is there a way to force Maxima to try to find a real solution to an 
integration problem so that it represents the area under the curve in cases 
where you get a complex number?

Consider,
kill(all)$
load(abs_integrate)$
rectform(float(rectform(integrate(exp(-signum(x-1)*x^3),x,-1,2))));
0.22200130530517 - 1.162123315419017 %i

If you plot the integrand it is just a real valued function with a well 
defined area under it but in this case it gives a complex number for an 
answer.

Rich
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