问题描述：
这种图在matlab怎么画出来的
注意图例.
线形上怎么加三角形啥的.
问题解答：
我来补答
x=0:1:100;
y=x.^2;
plot(x,-1.*y,'r-o','MarkerFaceColor','red')
hold on;
plot(x,-2.*y,'g-*','MarkerFaceColor','g')
plot(x,-3.*y,'b->','MarkerFaceColor','b')
plot(x,-4.*y,'m-^','MarkerFaceColor','m')
legend('Location','SouthWest')
y=x.^2;
plot(x,-1.*y,'r-o','MarkerFaceColor','red')
hold on;
plot(x,-2.*y,'g-*','MarkerFaceColor','g')
plot(x,-3.*y,'b->','MarkerFaceColor','b')
plot(x,-4.*y,'m-^','MarkerFaceColor','m')
legend('Location','SouthWest')
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