Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1998
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1998

[Date Index] [Thread Index] [Author Index]

Search the Archive

Mathmatica Problem...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14320] Mathmatica Problem...
  • From: "Mr D.J. Winstanley" <d.j.winstanley at ic.ac.uk>
  • Date: Tue, 13 Oct 1998 01:21:33 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Dear mathgroup,

We have just upgraded to release 3 of mathematica and we  have found a
problem with the Expand function as described in the mathematica
manual.  Here is the mathematica 3.0 output...


In[3]:= Expand[Cos[x]^3 Sin[x]^2,Trig->True]

gives
 
              3       2
Out[3]= Cos[x]  Sin[x]
 

this is not the answer given in the manual, which is...

  Cos[x] - Cos[3 x] - Cos[5 x]
  ------   --------   --------
    8         16         16


We were led to believe that the new version was compatible with the
previous version.

Is there a switch to obtain compatibility???

Any comments on this would be appreciated.  Also who should I send this
to at Wolfram?

thanks for your help


David Winstanley
IT Services Manager
Electrical and Electronic Engineering Department Room 1002, E&EE
Building
Imperial College
Exhibition Road
LONDON SW7 2BT

Phone: 0171-594-6273 or extn. 46273
Fax:   0171-823-8125
E-mail: d.j.winstanley at ic.ac.uk



  • Prev by Date: Re: Getting Delayed rules from NSolve
  • Next by Date: [Re: [Q] Help with PrimitiveRoot]
  • Previous by thread: Re: Mathematica 3 speed on a Sun Ultra1/200e ?
  • Next by thread: Re: Mathmatica Problem...