Mathematica help

[jemma]

Hi, I'm using NSolve in Mathematica but I only want to find the roots that are real numbers as my answer gives a lot of imaginary numbers. How can I do this?

I want to then plot a birfucation diagram using a table of data. Is there a function to do this?

Thanks!

[Bill Simpson]

In[1]:=x /. NSolve[(x - 1)(x^2 + 3)(x^4 + 5) == 0, x]
Out[1]={-1.05737 - 1.05737*I, -1.05737 + 1.05737*I, -3.81167*^-27 - 1.73205*I,
-3.81167*^-27 + 1.73205*I, 1., 1.05737 - 1.05737*I, 1.05737 + 1.05737*I}

In[2]:=Cases[x /. NSolve[(x - 1)(x^2 + 3)(x^4 + 5) == 0, x], _Real]
Out[2]={1.}

http://search.wolfram.com/?query=bifurcation&x=5&y=4

[nalkapo]

can anyone help me with this question? please look at link...
http://www.physicsforums.com/showthread.php?t=434501

thanks