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MathGroup Archive 1998

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RE: calculation



Hi
Yes, you can manipulate your equation to get :

R^(73/26) - 28745.5 ( Sqrt[R]-1 ) 0

If you plot the two terms above, you can see the problem...that one of
them has an almost infinite slope compared to the other near the
solution which must be close to R1.  You can use FindRoot on the
above equation to get the solution R -> 1.00007

Hope that helps.

RF


-----Original Message-----
From:	Saeed Esmaily Rashid [SMTP:saeedr@stud.ntnu.no] To:
mathgroup@smc.vnet.net
Sent:	Friday, April 17, 1998 1:21 AM To:	mathgroup@smc.vnet.net
Subject:	[mg11966] calculation

Hello!

My name is Saeed and i'm studying physics. I have a problem which ihope
someone can help me with it. I have an equation

.001422409738*R^(73/80)*(R^(1/2)-1)^(-13/40) .04

i'm using the Solve function in Mathematica 3.0 to solve it for R, but
it calculats endlessly and takes very long time. the question is that
is there any way to optimize this equation or using another function in
Mathematica 3.0 to make it faster to calculate?

Regards




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