functions in zroots.i - z

    zroots(a)  


returns the vector of (complex) roots of the (complex)   
polynomial: Sum(a(i)*x^(i-1)) using Laguerre's method.  
The roots are sorted in order of increasing real parts.  Call with  
non-zero imsort keyword to sort into increasing imaginary parts.  
See Numerical Recipes (Press, et. al., Cambridge Univ. Press 1988),  
section 9.5.  
Interpreted function, defined at i/zroots.i   line 10