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Re: calculating points

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122536] Re: calculating points
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Mon, 31 Oct 2011 06:51:40 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

On 10/30/11 at 4:25 AM, motorbikeman at gmail.com (steven darcy) wrote:

>I have a function f[x]=[129.3 - 25.3 Cos[x] - Sqrt[10816 -
>(25.3*Sin[x])^2] how can i find the y value for a given x value?

=46irst, define your function with appropriate syntax such as:

f[x_] := 129.3 - 25.3 Cos[x] - Sqrt[10816 - (25.3*Sin[x])^2]

then you can find x values for a given function value using FindRoot. For example,

In[4]:= FindRoot[f[x] == 30, {x, 2}]

Out[4]= {x->1.63361}




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