Question

Matlab画图像总是提示出错，求各位高手帮帮小弟！！

程序如下：
x=0:0.01:10
l1=0.8*sin(3*x)
l2=0.8*sin(3*x)
l3=0.6*sin(3*x)
a=200
b=120
Xp=-(l2^2-l3^2)/(2*(a-b))
Yp=b/2-a/2 + ((l1 - ((a - b + l2 + l3)*(b - a + l2 + l3)*(a - b + l2 - l3)*(a - b - l2 + l3))^(1/2)/(2*(a - b)))*(l1 + ((a - b + l2 + l3)*(b - a + l2 + l3)*(a - b + l2 - l3)*(a - b - l2 + l3))^(1/2)/(2*(a - b))))^(1/2)
Zp=((a - b + l2 + l3)*(b - a + l2 + l3)*(a - b + l2 - l3)*(a - b - l2 + l3))^(1/2)/(2*(a - b))
plot(x,Xp,'k-')
plot(x,Yp,'k-')
plot(x,Zp,'k-')
grid on

提示错误如下：
Error using ^
Inputs must be a scalar and a square matrix.
To compute elementwise POWER, use POWER (.^) instead.

Error in Untitled4 (line 8)
Yp=b/2 - a/2 + ((l1 - ((a - b + l2 + l3).*(b - a + l2 + l3).*(a - b + l2 - l3).*(a - b - l2 +
l3))^(1/2)/(2*(a - b))).*(l1 + ((a - b + l2 + l3).*(b - a + l2 + l3).*(a - b + l2 - l3).*(a - b - l2 +
l3

怎么破？？

Answer 1

x=0:0.01:10;
l1=0.8*sin(3*x);
l2=0.8*sin(3*x);
l3=0.6*sin(3*x);
a=200;
b=120;
Xp=-(l2.^2-l3.^2)./(2*(a-b));
Yp=b/2-a/2 + ((l1 - ((a - b + l2 + l3).*(b - a + l2 + l3).*(a - b + l2 - l3).*(a - b - l2 + l3)).^(1/2)/(2*(a - b))).*(l1 + ((a - b + l2 + l3).*(b - a + l2 + l3).*(a - b + l2 - l3).*(a - b - l2 + l3)).^(1/2)/(2*(a - b)))).^(1/2);
Zp=((a - b + l2 + l3).*(b - a + l2 + l3).*(a - b + l2 - l3).*(a - b - l2 + l3)).^(1/2)/(2*(a - b));
plot(x,Xp,'k-');
plot(x,Yp,'k-');
plot(x,Zp,'k-');
grid on
按上面语句试试

Answer 2

将^ 替换为.^