Your message dated Thu, 31 Jul 2014 11:23:43 -0400
with message-id <[email protected]>
and subject line Re: Bug#598158: maxima: does not simplify simple integrals
involving absolute values
has caused the Debian Bug report #598158,
regarding maxima: does not simplify simple integrals involving absolute values
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
598158: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=598158
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: maxima
Version: 5.22.1-4
Severity: normal
Maxima is missing the logic to perform integrals with simple absolute value
signs in them. For example,
integrate(exp(+x-%i*x),x,minf,0); and
integrate(exp(-x-%i*x),x,0,inf);
will both be simplified by maxima, while
integrate(exp(-abs(x)-%i*x),x,minf,inf); will be left in integral form, even
though it is equivalent to the sum of the two previous integrals.
-- System Information:
Debian Release: squeeze/sid
APT prefers unstable
APT policy: (600, 'unstable'), (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages maxima depends on:
ii gnuplot-x11 4.4.0-1 A command-line driven interactive
ii libc6 2.11.2-6 Embedded GNU C Library: Shared lib
ii libgmp3c2 2:4.3.2+dfsg-1 Multiprecision arithmetic library
ii libreadline6 6.1-3 GNU readline and history libraries
ii libx11-6 2:1.3.3-3 X11 client-side library
Versions of packages maxima recommends:
ii evince [postscript-viewer] 2.30.3-1 Document (postscript, pdf) viewer
ii ghostscript [postscript-vie 8.71~dfsg2-6 The GPL Ghostscript PostScript/PDF
ii gv [postscript-viewer] 1:3.7.1-1 PostScript and PDF viewer for X
ii maxima-share 5.22.1-4 A computer algebra system -- extra
Versions of packages maxima suggests:
ii maxima-doc 5.22.1-4 A computer algebra system -- docum
pn maxima-emacs <none> (no description available)
pn texmacs <none> (no description available)
ii tk8.4 [wish] 8.4.19-4 Tk toolkit for Tcl and X11, v8.4 -
ii tk8.5 [wish] 8.5.8-1 Tk toolkit for Tcl and X11, v8.5 -
-- no debconf information
--- End Message ---
--- Begin Message ---
Robert Dodier <[email protected]> writes:
> Maxima can solve some integrals involving absolute values,
> including the example given (integrate(exp(-abs(x)-%i*x),x,minf,inf)),
> via the package abs_integrate.
>
> (%i2) load (abs_integrate);
> (%o2)
>
> /usr/local/share/maxima/5.32.1/share/contrib/integration/abs_integrate.mac
> (%i3) integrate(exp(-abs(x)-%i*x),x,minf,inf);
> Principal Value
> (%o3) 1
>
> My recommendation is to close this report as "not a bug" or something
> like that; no matter how extensive the integration routines are,
> there will always be some integrals which it cannot solve,
> and although it's regrettable, it's not a bug.
>
Greetings! Agreed. Thanks for the useful comments, which will be filed
with the report for future reference.
Take care,
--
Camm Maguire [email protected]
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
--- End Message ---
