MATLAB: Highlight y-max

Question

So I'm wondering how I would highlight the y-max for my "Original Data" plot. Below is my code but I only want to highlight the y-max for the "Original data" plot.

Thanks,

Ben

h = input("Initial height (m): ");                  %Initial height
angle = input("Initial Angle of elavation: ");    %Degrees
v = input("Initial velocity (m/s): ");                       %M/S
g=-9.81;                                                     %M/S^2
angles = 0:10:180;
heights = 0:10:100;
velocity = 10:10:100;
figure
    [x_val,y_val] = Arc(g,h,angle,v);
    
    plot(x_val,y_val);
    hold on;
    
    xlabel 'x (m)'
    ylabel 'y (m)'
    title 'Original Data'
figure
for a = angles
    
    [x_val,y_val] = Arc(g,h,a,v);
    
    plot(x_val,y_val);
    hold on;
end
xlabel 'x (m)'
ylabel 'y (m)'
title 'Angles 0-180'
figure
for hi = heights
    
    [x_val,y_val] = Arc(g,hi,angle,v);
    
    plot(x_val,y_val);
    hold on;
end
xlabel 'x (m)'
ylabel 'y (m)'
title 'Height'
figure
for vel = velocity
    
    [x_val,y_val] = Arc(g,h,angle,vel);
    
    plot(x_val,y_val);
    hold on;
end
xlabel 'x (m)'
ylabel 'y (m)'
title 'Velocity'
function [x_val,y_val] = Arc(g,h,angle,v)
y = h;
t = 0;
x_val = [];
y_val = [];
while y >= 0
    
y=.5*g*t.^2+v*sind(angle)*t+h;
x=v*cosd(angle)*t;
t = t + 0.01;
x_val = [x_val,x];
y_val = [y_val,y];
end
end

Answer 1

 plot(x_val,y_val);
    hold on;
    [~,idx] = max(y_val); 
    plot(x_val(idx),y_val(idx),'r*')
    text(x_val(idx),y_val(idx),'max','VerticalAlignment','Bottom','HorizontalAlignment','Left','FontSize',8)
    
    xlabel 'x (m)'
    ylabel 'y (m)'
    title 'Original Data'