Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2001
*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 2001

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

Search the Archive

Re: kernel problem for trigonometry

  • To: mathgroup at smc.vnet.net
  • Subject: [mg29850] Re: kernel problem for trigonometry
  • From: "Orestis Vantzos" <atelesforos at hotmail.com>
  • Date: Fri, 13 Jul 2001 04:19:30 -0400 (EDT)
  • Organization: National Technical University of Athens, Greece
  • References: <9ijhqn$rhr$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Well, the trig expression does not evaluate to anything by itself, unless
you use N to turn it into a real number.
By calling FullSimplify you tell Mathematica to apply trig identities in an
effort to simplify the expr. It is obvious that simple arguments like Pi, 2
Pi, Pi/2, Pi/3 etc. simplify immedaitely to algebraic expressions involving
simple roots. Not so classical arguments like 220deg do not map readily to
algebraic expr. of roots. It is obvious that there is a wide range of
possible transformation that could be applied, so it is only natural that
FullSimplify takes a lot of time to navigate through the mess of trig
identiies.
Orestis
"Soh Pek Hooi" <fbasohph at nus.edu.sg> wrote in message
news:9ijhqn$rhr$1 at smc.vnet.net...
> Hi,
>
> May I find out the reason for the Kernel to compute the following with
> longer than the normal response time? It take several minutes to return a
> value, especially when the degree is not one of 0, 30, 45, 90 Degrees, and
> so on.
>
> FullSimplify[Sin[110 Degree]/Cos[220Degree]]
>
> Will appreciate your reply.
>
> Pek
>




  • Prev by Date: Re: Changing Pure Function in Module
  • Next by Date: Re: Naming pieces of patterns
  • Previous by thread: Re: kernel problem for trigonometry
  • Next by thread: Naming pieces of patterns