Hello, I have a hard time seeing how to best implement the following : I have a complicated equation of 4 variables that I need evaluated with a certain number of digits in precision (30 or so) : dummy = (15/4)*(1/(pow(xi,5)*(1+i-k)*(2+i-k)*(3+i-k)*(4+i-k)*(5+i-k)))*( ( (3*pow(3+i-k,2)-(1+i-k)*(5+i-k))*pow(xi*xi-xb,2) -2*(2+i-k)*(4+i-k)*(1-xi*xi)*(xb*xb-xi*xi) ) * ( pow((xb+xi)/(1+xi),3+i-k)- pow((xb-xi)/(1-xi),3+i-k) ) + 6*(3+i-k)*xi*(1-xb)*(xi*xi-xb)*(pow((xb+xi)/(1+xi),3+i-k)+ pow((xb-xi)/(1-xi),3+i-k)) ); where the variables are i, k, xb and xi. Although most of the equation is relatively easy to implement in CLN, I have a hard time figuring out how to deal with the "pow". There appears to be no such exponant function for floats ? Also, it is still unclear to me how to enter this equation painlessly into my code. Do I have to put cl_float(1,30) when I use 1 for instance ? (same for other numbers). Should I evaluate this in floating precision or with "real numbers" ? And finally how do I evaluate expressions such as (something)^(something else) with the (something else) NOT being an integer. Sorry about the very basic questions but most of the demo examples deal with integers and the few that do not, have very little information in them. Thank you for your time, Franck