import java.util.Scanner;

/*求矩阵的伴随矩阵*/

public class ajoint_matrix {

private static float[][] get_complement(float[][] data, int i, int j) {

/* x和y为矩阵data的行数和列数 */

int x = data.length;

int y = data[0].length;

/* data2为所求剩余矩阵 */

float data2[][] = new float[x - 1][y - 1];

for (int k = 0; k < x - 1; k++) {

if (k < i) {

for (int kk = 0; kk < y - 1; kk++) {

if (kk < j) {

data2[k][kk] = data[k][kk];

} else {

data2[k][kk] = data[k][kk + 1];

}

}

} else {

for (int kk = 0; kk < y - 1; kk++) {

if (kk < j) {

data2[k][kk] = data[k + 1][kk];

} else {

data2[k][kk] = data[k + 1][kk + 1];

}

}

}

}

return data2;

}

/* 计算矩阵行列式 */

private static float cal_det(float[][] data) {

float ans=0;

/*若为2*2的矩阵可直接求值并返回*/

if(data[0].length==2){

ans=data[0][0]*data[1][1]-data[0][1]*data[1][0];

}

else{

for(int i=0;i

/*若矩阵不为2*2那么需求出矩阵第一行代数余子式的和*/

float[][] data_temp=get_complement(data, 0, i);

if(i%2==0){

/*递归*/

ans=ans+data[0][i]*cal_det(data_temp);

}

else{

ans=ans-data[0][i]*cal_det(data_temp);

}

}

}

return ans;

}

/*计算矩阵的伴随矩阵*/

private static float[][] ajoint(float[][] data) {

int M=data.length;

int N=data[0].length;

float data2[][]=new float[M][N];

for(int i=0;i

for(int j=0;j

if((i+j)%2==0){

data2[i][j]=cal_det(get_complement(data, i, j));

}

else{

data2[i][j]=-cal_det(get_complement(data, i, j));

}

}

}

/*将矩阵转置*/

return trans(data2);

}

/*转置矩阵*/

private static float [][]trans(float[][] data){

int i=data.length;

int j=data[0].length;

float[][] data2=new float[j][i];

for(int k2=0;k2

for(int k1=0;k1

data2[k2][k1]=data[k1][k2];

}

}

return data2;

}

public static void main(String[] args) {

/* 输入原矩阵矩阵 */

Scanner scan = new Scanner(System.in);

System.out.println("输入矩阵的行数和列数");

int x = scan.nextInt();

int y = scan.nextInt();

float data[][] = new float[x][y];

System.out.println("输入矩阵");

for (int k = 0; k < x; k++) {

for (int kk = 0; kk < y; kk++) {

data[k][kk] = scan.nextFloat();

}

}

System.out.println("该矩阵的伴随矩阵为：");

float data2[][]=new float[x][y];

data2=ajoint(data);

for(int i=0;i

{

for(int j=0;j

System.out.print(data2[i][j]+" ");

}

System.out.println();

}

}

}