How to show/ indicate the absolute Maximum and Minimum on a plot in matlab?

Question

评论： Joe Vinciguerra 2019-12-10

y0=0

y1=piecewise(x<=0,0, 0<x<4,15408,4<x<=16,(-3424*x) + 29104, x>=16, 0);

fplot (y1, 'b', 'LineWidth', 2);

hold on;

figure (1); fplot(y0, 'black', 'LineWidth', 1);

title ('The Shear Force Diagram')

xlim([-1,17]);

ylim([-27000,16000]);

xlabel('X[ft]');

ylabel ('V[lb]');

I need to show a marker at the absolute maximum on this plot

I know it is at x=16 and y= -2.568e4

Joe Vinciguerra 2019-12-10

Check out https://www.mathworks.com/help/matlab/ref/annotation.html

Answer 1

Image Analyst 2019-12-10

Since you know x and y, how about

hold on;
plot(x, y, 'ro', 'LineWidth', 2, 'MarkerSize', 20); % Plot a circle around the max

Adjust the numerical parameters to your liking.