RE: Why can't Mathematica find this root?
- To: mathgroup at smc.vnet.net
- Subject: [mg38294] RE: [mg38274] Why can't Mathematica find this root?
- From: "Florian Jaccard" <jaccardf at eicn.ch>
- Date: Thu, 12 Dec 2002 01:31:11 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Strange, indeed... I tried the RootSearch package from Ted Ersek... It works fine on your example ! http://www.mathsource.com/Content/Enhancements/Numerics/0211-734 In[11]:= RootSearch[f'[x]==0,{x,3,3.2}] >From In[11]:= {{x -> 3.141592653589793}} Florian Jaccard e-mail : jaccardf at eicn.ch -----Message d'origine----- De : Konrad Den Ende [mailto:konrad at voxway.com] Envoyé : mar., 10. décembre 2002 10:17 À : mathgroup at smc.vnet.net Objet : [mg38274] Why can't Mathematica find this root? Regard this function: f[x_] := Sin[x]^3 * Cos[x] And then try this: Solve[f'[x] == 0, x] and you'll get a list of all roots but one. I wonder why. By regarding f'[x] one can directly see that x = pi is a root, yet, Mathematica fails to see it... Vänligen Konrad -------------------