20 lines
473 B
Java
20 lines
473 B
Java
public static double[][] mult(double a[][], double b[][]){//a[m][n], b[n][p]
|
|
if(a.length == 0) return new double[0][0];
|
|
if(a[0].length != b.length) return null; //invalid dims
|
|
|
|
int n = a[0].length;
|
|
int m = a.length;
|
|
int p = b[0].length;
|
|
|
|
double ans[][] = new double[m][p];
|
|
|
|
for(int i = 0;i < m;i++){
|
|
for(int j = 0;j < p;j++){
|
|
for(int k = 0;k < n;k++){
|
|
ans[i][j] += a[i][k] * b[k][j];
|
|
}
|
|
}
|
|
}
|
|
return ans;
|
|
}
|