Mingwu Bai asked: > How to solve following two non-linear equations by Fortran or by matlab? > > f(x,y)=0 > g(x,y)=0 > > f(x,y) and g(x,y) are very complex. Look at http://math.nist.gov/cgi-bin/gams-serve/class/F2.html %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%