Lambert_W_function INDEX

LAMBERT\_W FUNCTION _ _ _ _ _ _ _ _ _ _ _ _ operator

Lambert's W function is the inverse of the function w * e**w. It is used in the solve package for equations containing exponentials and logarithms.

syntax:

Lambert_W(<z>)

examples: 


Lambert_W(-1/e); 

  -1 


solve(w + log(w),w); 

  w=lambert_w(1)


on rounded; 

Lambert_W(-0.05); 

  - 0.0527059835515

The current implementation will compute the principal branch in rounded mode only.