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MathGroup Archive 2005

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Re: Simplify[expr] bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53428] Re: [mg53398] Simplify[expr] bug?
  • From: yehuda ben-shimol <benshimo at bgu.ac.il>
  • Date: Tue, 11 Jan 2005 01:31:24 -0500 (EST)
  • References: <200501100404.XAA14039@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Ken,
All are syntax problems. Arguments of functions are surrounded by 
brackets []
So test 1:
Simplify[Sin[a]-Sin[b]]

the expression is already in simplified form so it will not be changed

Test 2:
I couldn't figure out why you wrote a superscript for 1, but again 
change the Cos( .. ) to Cos[.. ]

yehuda



Ken Tozier wrote:

>I'm a complete newbie to Mathematica and not a math whiz, but the 
>results I got from the following two equations seems like bugs to me.
>
>Test 1:
>Running: Simplify[Sin(a) - Sin(b)]
>Yeilds: (a - b)Sin
>
>Looks like it's treating the function "Sin" like a coefficient
>
>Test 2:
>Running: Simplify[d/s + Cos(2*¹*v/s) - Cos(2*¹*(v - 1)/s)]
>Yeilds: (d + 2 Cos ¹) / s
>
>Mathematica completely factors out the variable "v" which is critical 
>to the correct solution.
>
>Are these bugs or am I making an inadvertent syntax error.
>
>Thanks,
>
>Ken Tozier
>
>  
>


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