I generated a 24 * 7 matrix, want to be in the 24 arbitrary line extraction of 7 lines, these lines are not in order of submatrix extraction, but random extraction), so that you can get a lot of 7 * 7 square, each square for Ai, I want to do is to put a square matrix eigenvalue calculated, and then fill in turn into a new matrix,

CodePudding user response:

Fyi:

 # include & lt; stdio.h> 
# include & lt; Stdlib. H> 
# include & lt; Time. H> 
Int d [6]; 
Int I, n, a, b, t; 
C, int j; 
Void main () {
srand(time(NULL)); 
Printf (" shuffle 0.. N - 1 demo \ n "); 
For (n=1; n<=5; N++) {/* (1 ~ 5 */
Printf (" _____n=% d_____ \ n ", n); 
J=1; 
For (c=1; C<=n; C + +) j=j * c;/* j for n! */
J *=n * 2; 
For (c=1; C<=j; C + +) {/* test n * 2 * n! Time */
for (i=0; iFor (I=n; I> 0; I -) {/* disturb 0 ~ */n - 1 
A=I - 1; B=rand () % I; 
If (a! A=b) {t=d [a]; D [a] [b]=d; D [b]=t; } 
} 
Printf (" % 4 d: ", c); 
for (i=0; iprintf("\n"); 
} 
} 
Printf (" shuffle 1.. N demo \ n "); 
For (n=1; n<=5; N++) {/* (1 ~ 5 */
Printf (" _____n=% d_____ \ n ", n); 
J=1; 
For (c=1; C<=n; C + +) j=j * c;/* j for n! */
J *=n * 2; 
For (c=1; C<=j; C + +) {/* test n * 2 * n! Time */
For (I=1; i<=n; I++) d [I]=I;/* fill in 1 ~ n */
For (I=n; I> 1; I -) {/* disturb 1 ~ n */
A=I; B=rand () % I + 1; 
If (a! A=b) {t=d [a]; D [a] [b]=d; D [b]=t; } 
} 
Printf (" % 4 d: ", c); 
For (I=1; i<=n; I++) printf (" % d ", d [I]); 
printf("\n"); 
} 
} 
}