Thread: Undefined symbol error??

Hi, I am doing a program that does all types of stuff with complex numbers. I think I have the code written correctly but keep getting an Undefined symbol error. It tells me sqrt and arctan and gives the file complex.o . I have #include <math.h> in my complex.c file and am using a makefile with the LIB of -lm. And everywhere I look, it says to do these things but they are already done. What could be wrong? I posted the code for the functions that use sqrt and arctan and maybe my syntax is just wrong.

Code:

#include <math.h>
          .
          .
          .
double MagCmplx(Cmplx z)
{
   /* Write this function */
  double m;

  m = sqrt(((z->x)*(z->x)) + ((z->y)*(z->y)));
return m;
}

double AngleCmplx(Cmplx z)
{
   /* Write this function */
  double theta;
  if((z->y)==0 && (z->x)>0)
    theta = 0;
  else if((z->y)==0 && (z->x)<0)
    theta = PI * (-1);
  else
    theta = arctan((z->x),(z->y));

return theta;
}

Please help!!! Thanks so much!

--Jacob