p05218.m

本程序提供三矢量混合积的计算

clear;newplot;
axis([-2,19,-5,12]);
axis off;
text(2.5,12,'三矢量的混合积','Fontsize',20,'color','green');
hold on;
X=[0,3,13,10,0];
Y=[0,-3,-3,0,0];
plot(X,Y,'c');
text(1.3,-2,'→');
text(1.4,-2.2,'a');
X=[0,3];
Y=[0,-3];
fline(X,Y,'m');
X=[4,7,17,14,4];
Y=[7,4,4,7,7];
plot(X,Y,'c');
X=[0,10];
Y=[0,0];
fline(X,Y,'m');
text(5.5,.5,'b');text(5.4,.7,'→');
X=[0,4];
Y=[0,7];
plot(X,Y,'c');
X=[3,7];
Y=[-3,4];
plot(X,Y,'c');
X=[13,17];
Y=[-3,4];
plot(X,Y,'c');
X=[10,14];
Y=[0,7];
plot(X,Y,'c');
X=[0,0];
Y=[0,10];
fline(X,Y,'r');
text(-1.5,5,'axb');text(-1.6,5.3,'→');
text(-.75,5.3,'→');
text(2,4.5,'c');text(1.9,4.7,'→');
hold off;
axis off;