Re: Using FindRoot

*To*: mathgroup at smc.vnet.net*Subject*: [mg24880] Re: [mg24862] Using FindRoot*From*: "Tomas Garza" <tgarza at mail.internet.com.mx>*Date*: Sat, 19 Aug 2000 04:45:53 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Alan [mailto:kd7cyb at mac.com] wrote: > Can you solve the exact answer (meaning as close as possible that > equally satisfies both sides with the same result) to equations like > these below using FindRoot, and how? Or do you use a better function? > > > (*Can FindRoot get the closest answer possible to this equation or ones > like it below?*) > > x^2==x^3 > (*OR*) > x^2==x I guess that is the whole point of Mathematica functions such as Solve and FindRoot. E.g. In[11]:= Solve[x^2 == x^3, x] Out[11]= {{x -> 0}, {x -> 0}, {x -> 1}} Here you have the 3 roots of the polynomial x^3 - x^2 (0 with multiplicity 2). In[12]:= FindRoot[x^2 == x^3, {x, 0}] Out[12]= {x -> 0.} Here you have a root found using as starting value x = 0. Check the on-line help browser where you will find a complete description of each, plus examples. Tomas Garza Mexico City