Aims to minimize the function f(x, y), where the range of x and y are provided. f(x, y) is calculated by the ratio of functions g(x, y) and h(x, y, z), where h(x, y, z) is minimized for each (x, y) and the range z is provided.   Example: f(x, y)=g(x, y)/min (h(x, y, z)); g(x, y)=1/x+1/y; h(x, y, z)=x/z+y;   The below code is definitely not working but I like to show what the picture is   proc iml;   start funch(x) global(var1 var2);   f = var1/x[1]+var2; *where var1 and var2 are x[1] and x[2] in funcf return (f); finish funch;   start funcf(x);  con = {1,        10};   x0 = {1};             optn = {1                         1};               call nlphqn(rc, xres, "funch", x0, optn) blc=con;      h=x[1]/xrec+x[2];   g=1/x[1]+1/x[2];   f = g/h; return (f); finish funcf;   con = {0.01 0.02,        0.05 0.05}; x0 = {0.01 0.02};           optn = {1                       1};             call nlphqn(rc, xres, "funcf", x0, optn) blc=con;  print xres;   Your help would be appreciated! ... View more