Add markers at min max points in a triangular plot

Hello, I wanted to add dots at the min, max points on the triangular plot that I have generated so that my final plot can look like this:

Here is the code that I have so far:

ts=0.1;
t=-5:ts:5;
y=repmat(max(t)-abs(t),1,3);
t=-3:ts:-3+length(y)*ts-ts;
ty=[((t+10)*5)' ((y+10)*5)'];
plot(((t+10)*5)', ((y+10)*5)', '--r', 'Linewidth', 1.5);

Answer 1

[Kian Azami]

You can change your code a little bit to have the results you want:

clc
close all
clear all
ts=0.1;
t=-5:ts:5;
y=repmat(max(t)-abs(t),1,3);
t=-3:ts:-3+length(y)*ts-ts;
ty=[((t+10)*5)' ((y+10)*5)'];
xData = ((t+10)*5)';
yData = ((y+10)*5)';
yIdx = find(yData == 50 | yData == 75);
yIdx = yIdx([1 2 3 5 6 8 9]);
plot(xData, yData, '--r', 'Linewidth', 1.5);
hold on
plot(xData(yIdx),yData(yIdx),'Marker','o','markersize',10,...
  'MarkerFaceColor','k',...
  'MarkerEdgeColor','r',...
  'linestyle','none')