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

Re: calculation




In a message dated 4/17/98 3:21:17 AM, saeedr@stud.ntnu.no wrote:

>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?


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

Plot[.001422409738*R^(73/80)*(R^(1/2)-1)^(-13/40) - .04, {R, 5, 100}];

FindRoot[eqn, {R, 80.}]

{R -> 81.26549297247551}


Bob Hanlon



  • Prev by Date: creating packages
  • Next by Date: Gauss seidel iteration
  • Prev by thread: Re: calculation
  • Next by thread: RE: calculation