Plot problem: How to mark a symbol "X".
显示 更早的评论
I had a question to plot two function on a graph, and for each intersection point of two function, mark a symbol "X". I don't know how to do it, Please help me.
回答（1 个）
Star Strider
2016-5-6
If you have calculated the intersection as a (xi,yi) pair, use the hold command, and then:
plot(xi, yi, 'x')
2 个评论
Phuc Tan Huynh
2016-5-6
Star Strider
2016-5-6
编辑：Star Strider
2016-5-7
My pleasure.
I would have to see your code.
However, if you used fzero, you probably have the ‘xi’ coordinates, and since fzero requires a function that most likely subtracts one function from another, you would use that value in one of the functions you used to calculate ‘xi’ to calulate ‘yi’.
Example:
f1 = @(x) 10 - 5*x;
f2 = @(x) x.^2 + 1;
xi = fzero(@(x) f1(x)-f2(x), 1);
t = linspace(0, 3);
figure(1)
plot(t, f1(t), '-b', t, f2(t), '-g')
hold on
plot(xi, f1(xi), 'xr', 'MarkerSize',20)
hold off
grid
类别
在 帮助中心 和 File Exchange 中查找有关 Calculus 的更多信息
2016-5-6
2016-5-7
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
