哪位高手看一下,这是输出什么?
哪位帮忙看看,这个程序想要输出什么,这个程序是什么意思?
被弄得太晕了。变理乱七八糟的。都不知道输出什么。请指点,给程序加上注释.
谢谢了。
#include "aband.c"
#include "stdio.h"
main()
{ int i;
static double b[8][5]={ {3.0,-4.0,1.0,0.0,0.0},
{-2.0,-5.0,6.0,1.0,0.0},{1.0,3.0,-1.0,2.0,-3.0},
{2.0,5.0,-5.0,6.0,-1.0},{-3.0,1.0,-1.0,2.0,-5.0},
{6.0,1.0,-3.0,2.0,-9.0},{-4.0,1.0,-1.0,2.0,0.0},
{5.0,1.0,-7.0,0.0,0.0}};
static double d[8][3]={ {13.0,29.0,-13.0},
{-6.0,17.0,-21.0},{-31.0,-6.0,4.0},{64.0,3.0,16.0},
{-20.0,1.0,-5.0},{-22.0,-41.0,56.0},{-29.0,10.0,-21.0},
{7.0,-24.0,20.0}};
if (aband(b,d,8,2,5,3)>0)
for (i=0;i<=7;i++)
printf("x(%d)=%13.7e, %13.7e, %13.7e\n",
i,d[i][0],d[i][1],d[i][2]);
}
#include "math.h"
#include "stdio.h"
int aband(b,d,n,l,il,m)
int n,l,il,m;
double b[],d[];
{ int ls,k,i,j,is,u,v;
double p,t;
if (il!=(2*l+1))
{ printf("fail\n"); return(-2);}
ls=l;
for (k=0;k<=n-2;k++)
{
p=0.0;
for (i=k;i<=ls;i++)
{
t=fabs(b[i*il]);
if (t>p) {p=t; is=i;}
}
if (p+1.0==1.0)
{
printf("fail\n"); return(0);
}
for (j=0;j<=m-1;j++)
{
u=k*m+j; v=is*m+j;
t=d[u]; d[u]=d[v]; d[v]=t;
}
for (j=0;j<=il-1;j++)
{ u=k*il+j; v=is*il+j;
t=b[u]; b[u]=b[v]; b[v]=t;
}
for (j=0;j<=m-1;j++)
{ u=k*m+j; d[u]=d[u]/b[k*il];}
for (j=1;j<=il-1;j++)
{ u=k*il+j; b[u]=b[u]/b[k*il];}
for (i=k+1;i<=ls;i++)
{ t=b[i*il];
for (j=0;j<=m-1;j++)
{ u=i*m+j; v=k*m+j;
d[u]=d[u]-t*d[v];
}
for (j=1;j<=il-1;j++)
{ u=i*il+j; v=k*il+j;
b[u-1]=b[u]-t*b[v];
}
u=i*il+il-1; b[u]=0.0;
}
if (ls!=(n-1)) ls=ls+1;
}
p=b[(n-1)*il];
if (fabs(p)+1.0==1.0)
{ printf("fail\n"); return(0);}
for (j=0;j<=m-1;j++)
{ u=(n-1)*m+j; d[u]=d[u]/p;}
ls=1;
for (i=n-2;i>=0;i--)
{ for (k=0;k<=m-1;k++)
{ u=i*m+k;
for (j=1;j<=ls;j++)
{ v=i*il+j; is=(i+j)*m+k;
d[u]=d[u]-b[v]*d[is];
}
}
if (ls!=(il-1)) ls=ls+1;
}
return(2);
}