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MathGroup Archive 1999

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Re: Mathematica on linux help and Mathematica returns wrong integral result

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19446] Re: Mathematica on linux help and Mathematica returns wrong integral result
  • From: Phil Mendelsohn <mend0070 at tc.umn.edu>
  • Date: Wed, 25 Aug 1999 01:25:15 -0400
  • Organization: University of Minnesota, Twin Cities Campus
  • References: <7ptalj$lit@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

As far as your cursor problems go, you should try checking what your
Mod2 button is.  Mod1 is probably the Alt key.  Mod2 is probably NumLock
-- and it affects this.  It took me a while to realize that was the
reason that sometimes I could get the menus to pull down using the right
mouse button, but not always.  I also had some trouble with selection. 
You can change this if you like; the docs say to use xmodmap outside
Mathematica.

As far as the wrong integral, I'll leave that to someone who has a
better idea, but I suspect that your answer is going to be "if you enter
it in [x] form, it will work" or "if you tell it to Evaluate part first,
the answer will be correct."

--Cheers,

Phil Mendelsohn

psalzman at landau.ucdavis.edu wrote:

> i have Mathematica for students, version 3.1 running on suse linux 6.1 with
> enlightenment (no gnome or kde).
> 
> very often when i want to click on something, the cursor (which is normally
> a pointer) becomes a hand and won't allow me to position it where i want.
> 
> for instance, i'm looking at the "help browser" right now, and i looked at
> "factor" because i want to find out how to factor a pi/2 in front of an
> expression.  it says "See also FactorTerms" as a blue hyperlink.  under
> windows, when i click on that, the help browser would display the help for
> FactorTerms.  here, when i go to click on it, the cursor becomes a hand and
> won't let me click on it.
> 
> this is kind of annoying -- can someone tell me how to avoid this?  at the
> very least, i want to be able to click on hyperlink help topics that appear
> in the help browser.
> 
> ===========================================================================
> wrong result
> 
> i've definitely confirmed that Mathematica definitely gives a wrong result for
> an integral.  i've have an integral which contains a product of 3
> bessel function of half order.  i expressed this integral in 3 ways --
> converting no  bessel functions as sin x/x, converting 1 bessel function as
> sin[x]/x, converting 2 besselfunctions as sin x/x and converting all 3 as
> sin x/ x.  the expressions are all equal, and the result that Mathematica gives is
> *almost* correct.


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