matlab編程求點的坐標

定義函數

function [x2,y2] = fourth(x,y)

z = x+j*y;

r(1) = abs(z(1)-z(2));

r(2) = abs(z(2)-z(3));

r(3) = abs(z(1)-z(3));

rmax = max(r);

k = 0;

for i = 1:3

if r(i)==rmax

k = i;

end

end

switch k

case 1

z(4) = z(1)+z(2)-z(3);

case 2

z(4) = z(2)+z(3)-z(1);

case 3

z(4) = z(1)+z(3)-z(2);

end

x2 = [x, real(z(4))];

y2 = [y,imag(z(4))];

輸入命令：

x = [a c e];y = [b d f];

[x,y] = fourth(x,y)

plot(x,y,'o')

%新坐標在x(4),y(4)