functions in zroots.i - l

             laguerre(a,x)  
 
     Given the coefficients a(1:m+1) of the m'th degree  
     complex polynomial Sum(a(i)*x^(i-1)) and a guess x, returns a root.  
     See Numerical Recipes (Press, et. al., Cambridge Univ. Press 1988),  
     section 9.5.  
interpreted function, defined at i/zroots.i   line 70