MATLAB向量画图

close all;clc;clear all;
testpoint=[2 0];
original=[0 0];
% plot
dirextion=[3,3];
quiver(0,0,testpoint(1),testpoint(2),'g','LineWidth',2);
hold on;
quiver(0,0,dirextion(1),dirextion(2),'r','LineWidth',2);
hold on;
afterMul=dirextion'*testpoint;
quiver(0,0,afterMul(1),afterMul(2),'b-','LineWidth',1);
grid on;
legend('Original','Direction','Original^T*Direction')