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  1. #include <math.h>
  2. #include <stdio.h>
  3.  
  4. float sin_0(float x)
  5. {
  6.   return sin(x);
  7. }
  8.  
  9. float cos_0(float x)
  10. {
  11.   return cos(x);
  12. }
  13.  
  14. float cosm1_0(float x)
  15. {
  16.   return cos(x)-1.0;
  17. }
  18.  
  19. float sinf_trad(float x)
  20. {
  21.   float h = x - 0x1.2660bcp-6f;
  22.  
  23.   return 0x1.265caep-6f * cos_0(h) + 0x1.ffead8p-1f * sin_0(h);
  24. }
  25.  
  26. float sinf_new(float x)
  27. {
  28.   float h = x - 0x1.2660bcp-6f;
  29.  
  30.   return 0x1.265caep-6f + (0x1.265caep-6f * cosm1_0(h) + 0x1.ffead8p-1f * sin_0(h));
  31. }
  32.  
  33. double m_err_trad, s_err_trad;
  34. double m_err_new, s_err_new;
  35.  
  36. int main(){
  37.  
  38.   for (float f = 0.01f; f <= 0.025f; f = nextafterf(f, 3.0f))
  39.     {
  40.       double r = sin(f);
  41.       float trad = sinf_trad(f);
  42.       float new = sinf_new(f);
  43.       double err_trad = fabs(r - trad);
  44.       double err_new = fabs(r - new);
  45.       s_err_trad += err_trad * err_trad;
  46.       s_err_new += err_new * err_new;
  47.       err_trad /= r;
  48.       err_new /= r;
  49.       if (err_trad > m_err_trad) m_err_trad = err_trad;
  50.       if (err_new > m_err_new) m_err_new = err_new;
  51.     }
  52.  
  53.   printf("relative error, traditional: %e, new: %e\n", m_err_trad, m_err_new);
  54.   printf("sum of squares of absolute error, traditional: %e, new: %e\n", s_err_trad, s_err_new);
  55. }
  56.  
Time limit exceeded #stdin #stdout 5s 2244KB
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https://ideone.com/coI3u9
language:
C99 (gcc 8.3)
created:
9 years ago
visibility:
public

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