matlab怎么画二维向量图:A是个二维向量,B也是,C=A+B,怎么把这三个向量...答:clear;clf;A=[4,5];B=[-10,0];C=A+B;M=[A;B;C];X=[M(:,1);A(1)];Y=[M(:,2);A(2)];plot(X,Y,'r')axis ([-12 6 -1 6])grid on text(A(1),A(2),'A')text(B(1)-0.2,B(2)-0.2,'B')text(C(1),C(2)+0.2,'C')scale=1;hold on quiver(A(...