public void leftMultiply(Matrix other) {
// other * this
if (other.col != this.row) {
System.err.println("attempt to multiply incompatible matrices.");
System.exit(1);
} else {
tempCopy();
for (int i = 0; i < other.row; i++) {
for (int j = 0; j < tempElements[0].length; j++) {
// multiply other row by this col to get replacement elements[i][j]
double replacement = 0;
for (int k = 0; k < other.col; k++) {
replacement += other.get(k, i) * tempElements[k][j];
}
this.set(j, i, replacement);
}
}
}
}
public void rightMultiply(Matrix other) {
// this * other
if (this.col != other.row) {
System.err.println("attempt to multiply incompatible matrices.");
System.exit(1);
} else {
tempCopy();
for (int i = 0; i < tempElements.length; i++) {
for (int j = 0; j < other.col; j++) {
// multiply this row by other col to get replacement elements[i][j]
double replacement = 0;
for (int k = 0; k < tempElements[0].length; k++) {
replacement += tempElements[i][k] * other.get(j, k);
}
this.set(j, i, replacement);
}
}
}
}