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  1. #include <cstdio>
  2. #include <cmath>
  3.  
  4. void f(
  5. 	float phi,
  6. 	float omega,
  7. 	float kappa,
  8. 	unsigned int n)
  9. {
  10. 	float
  11. 		c=std::cos(phi),
  12. 		s=std::sin(phi),
  13. 		a=std::cos(omega+0.5f*kappa),
  14. 		b=std::sin(omega+0.5f*kappa),
  15. 		u=std::cos(kappa),
  16. 		v=std::sin(kappa);
  17. 	float c0,s0,a0,b0,u0,v0;
  18.  
  19. 	float d=0.0f;
  20.  
  21. 	for(unsigned int i=0;i<n;++i)
  22. 	{
  23. 		c0=c;
  24. 		s0=s;
  25. 		a0=a;
  26. 		b0=b;
  27. 		c=a0*c0-b0*s0;
  28. 		s=a0*s0+b0*c0;
  29. 		a=u*a0-v*b0;
  30. 		b=v*a0+u*b0;
  31. 		if(i%64==0)
  32. 		{
  33. 			float n=1.5f-0.5f*(c*c+s*s);
  34. 			c*=n;
  35. 			s*=n;
  36. 		}
  37. 		float e=std::fabs(std::cos(phi+omega*float(i)+0.5f*kappa*float(i*i))-c0);
  38. 		if(d<e)	d=e;
  39. 	}
  40. 	printf("%f\n",d);
  41. }
  42.  
  43. int main()
  44. {
  45. 	float dt=1.0f/44100.0f;
  46. 	f(1.0f,1000.0f*dt,1000.0f*dt*dt,10000);
  47. 	f(0.0f,1000.0f*dt,1000.0f*dt*dt,10000);
  48. 	f(-2.0f,100.0f*dt,1000.0f*dt*dt,10000);
  49. 	f(-5.0f,10000.0f*dt,10.0f*dt*dt,10000);
  50. 	f(-5.0f,100.0f*dt,100.0f*dt*dt,10000);
  51. 	f(-5.0f,10.0f*dt,1000.0f*dt*dt,10000);
  52. 	f(-5.0f,1000.0f*dt,1.0f*dt*dt,10000);
  53. 	f(1.0f,440.0f*dt,0.0f*dt*dt,10000);
  54. 	return 0;
  55. }
Success #stdin #stdout 0.02s 3140KB
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stdin
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Standard input is empty
stdout
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0.015147
0.014906
0.005380
0.255586
0.001793
0.002093
0.025641
0.000005
https://ideone.com/wlp2xf
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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