hi my program of udf is following:

#include "udf.h" DEFINE_PROFILE(inlet_x_velocity, thread, position) { real x[ND_ND]; real y; face_t f; begin_f_loop(f, thread) { F_CENTROID(x,f,thread); z = x[1]; F_PROFILE(f, thread, position) = -43478.26*z*z-291.30*z+1.00; } end_f_loop(f, thread) }

when i compile the C program,my compter tell me there is an error.i want to know "why?"

pls help!

You have to declare your variable z before you use it. You defined y instead of z!

maybe this is the error ?!