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int svd(int m,int n,int withu,int withv,double eps,double tol,
double *a, double *q, double *u, double *v, double *vt)
{

int i,j,k,l,l1,iter,retval;
double c,f,g,h,s,x,y,z;
double *e;

e = (double *)calloc(n,sizeof(double));

retval = 0;
/* Cop ......

C\C++ Notes

CµÄstaticµÄÓ÷¨:
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2.¶ÔÓÚÈ«¾ÖµÄ±äÁ¿,¸Ä±äµÄÊÇËüµÄ×÷Ó÷¶Î§,Õâ¸ö±äÁ¿Ö»ÔÚ±¾ÎļþÄÚÓÐЧ.ÆäËüµÄ.cÎļþ¿´²»µ½.
   µ±È»ËüµÄÉúÃüÖÜÆÚÊǺͳÌÐòÒ»ÑùµÄ ......

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¿ìËÙÃÝȡģÀíÂÛ»ù´¡£º  ¼ÆËã a^b mod c ?
  ÓÉ(a x b) mod c=((a mod c) x b) mod c.
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   b=at2^t+at-1 2^t-1+……a02^0. (ai=[0,1]).
 ÕâÑùÎÒÃÇÓÉ a^b mod c=(a^(at2^t+at-12^t-1+…a02^0)mod c.
 È»¶øÎÒÃÇÇó  a^(2^(i+1)) ......

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ÎÊÌâÒ»ÃèÊö£º Óñê×¼Cдһ¸öÅжϸ ......

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enumÀàÐ͵ijÉÔ±£¬Ä¬ÈÏÇé¿öÏÂÊÇ´Ó0¿ªÊ¼¸³Öµ£» 
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#include <stdio.h>
typedef enum {
PLAYMODE = 1, // ĬÈÏ´Ó0¿ªÊ¼
PAUSEMODE,
STOPMODE = 5,
TRACKRPTMODE,
MIXMODE
}Status_t;
int main()
{
int n = 4;
sw ......
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