normtest.java

数学：数值分析：线性方程组 线性方程组的多种解法

package linearEquationGroup;

import java.util.Scanner;

public class NormTest {
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int n;
		double[] vector;
		double[][] matrix;
		String vOrM;
		String another = "y";

		System.out
				.println("\nthe program compute the norm of a vector or a matrix.\n");
		do {
			System.out.println("input v as vector,m as matrix:");
			vOrM = input.next();
			if (!vOrM.equalsIgnoreCase("v") && !vOrM.equalsIgnoreCase("m")) {
				System.out.println("don't input any else!");
				continue;
			} else if (vOrM.equalsIgnoreCase("v")) {
				System.out.println("input the vector's dimension:");
				n = input.nextInt();
				vector = new double[n + 1];
				System.out
						.println("input the elements of the vector(use space to seperate):");
				for (int i = 1; i < n + 1; i++)
					vector[i] = input.nextDouble();
				System.out.println("the one-norm of the vector:"
						+ Norm.vectorOne(n, vector));
				System.out.println("the two-norm of the vector:"
						+ Norm.vectorTwo(n, vector));
				System.out.println("the infinitive-norm of the vector:"
						+ Norm.vectorInfinitive(n, vector));
			} else {
				System.out.println("input the matrix's level:");
				n = input.nextInt();
				matrix = new double[n + 1][n + 1];
				System.out
						.println("left to right,up to down,"
								+ "input the elements of the matrix(use space to seperate):");
				for (int i = 1; i < n + 1; i++)
					for (int j = 1; j < n + 1; j++)
						matrix[i][j] = input.nextDouble();
				System.out.println("the one-norm of the matrix:"
						+ Norm.matrixOne(n, matrix));
				System.out.println("(not right)the two-norm of the matrix:"
						+ Norm.matrixTwo(n, matrix));
				System.out.println("the infinitive-norm of the matrix:"
						+ Norm.matrixInfinitive(n, matrix));
			}
			System.out
					.println("\n         input another vector or matrix?  y/n:");
			another = input.next();
		} while (another.equalsIgnoreCase("y"));

	}

}