Thread: Write a program in Java that multiplies the column vector A [n] by some number. The matrix and number are initiated by a random value generator.

Write a program in Java that multiplies the column vector A [n] by
some number. The matrix and number are initiated by a random value generator.

--- Update ---

Please I really need help

Originally Posted by Norm

What have you tried?
Post your current code and any questions about it.

i don't know how to implement it

This thread is old enough that doing other people's homework no longer applies, so here's my version

import java.util.Random;
 
public class Main{ 
  public static void main(String[] args) { 
    Random rng = new Random(); // random number generator
 
    // create a vector with ten random doubles in the range [0..1)
    double vector[] = new double[10];
 
    // load vector with random values
    for( int index = 0; index < vector.length; index++){
      vector[index] = rng.nextDouble();
    }
 
    displayVector(vector);
 
    // random multiplier int in range [0..100)
    int multiplier = rng.nextInt(100);
 
    // multiply vector by scaling factor (multiplier)
    for( int index = 0; index < vector.length; index++){
      vector[index] *= multiplier;
    }
 
    // display results
    System.out.println(
      String.format("scaled by a factor of %s", multiplier)
    );
    displayVector(vector);
 
  } // main
 
  // display vector
  static void displayVector(double[] vector){
    String output = "v[ ";
    for(double thisValue : vector){
      output += String.format("%4.4f ", thisValue);
    }
    System.out.println(output + "]");
  } // displayVector
 
} // Main