Re: How do you input a solution from FindRoot into another equation?

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg754] Re: How do you input a solution from FindRoot into another equation?*From*: dm5579 at glibm19.cen.uiuc.edu (Demetri Mouratis)*Date*: 13 Apr 1995 01:43:59 GMT*Organization*: UIUC Engineering Workstation Labs

In article <3mfauj$l4o at news0.cybernetics.net>, rdack at acs.ucalgary.ca (Robert Dack) writes: |> |> Can someone tell me how to take the output from the FindRoot |> cammand and input it into the next command line? The output |> comes out in the form { x -> 2.435 }, so the usual [%] command on |> the next line won't work. |> |> Any help in this area would be appriciated |> |> R Dack rdack at acs.ucalgary.ca |> |> |> |> Sure. The FindRoot command, returns a list as a solution. In your case the list is {x -> 2.435}. You want to get at an element within that list, the root. The Mathematica Part command allows you to do this. Here's an example: In[1]:= FindRoot[Sin[x]==0,{x,3}] Out[1]:= {x -> 3.14159} In[2]:= %[[1]] Out[2]:= x -> 3.14159 In[3]:= %[[2]] Out[3]:= 3.14159 You can combine the two steps into %[[1,2]] and get the same thing.