How to make axis continuous based on input

Hi, ive written a code based on projectile motion, and created a GUI with the intent to create an app as a project for university. The issue I run into is my x axis is pre-defined, I was wondering is there a way to change it to where it constantly increased until the line reaches zero in the y-direction, e.g. (6,0) or (58.53,0). In the code below the main block will be in the button callback section. The code below is just the script I use to test, as the forum did not let me post the GUI but its the same without the restrictions.

Thanks in advance!

%======================================================================%
%Arrow is fired from a cliff plot its projectile motion 10m above ground at
%20 m/s
%======================================================================%

clear all %clears workspace
%angle = 0.4; %Size of angle it is fired at in radians from cliff
V0 = 20; %inital velocity = 20 m/s
g = -9.81; %Gravity force taking up as +ive
t = 0:0.1:4; %time
%t = zeros(30);
%h = 10; %height
%Ax = 0; %Vertical Acceleration
Ay = g; %Horizontal Acceleration

%======================================================================%

  %xVelocity = V0 * cos(angle);
  yVelocity = V0 * sin(angle); %Vertical Velocity
  x = t; %x axis = time
  y = h + (yVelocity * t + (1/2) * Ay * t.^2); %s = ut + (0.5)at^2
    y = max(0,y);
%======================================================================% 
  plot(x, y);%+10 BECAUSE 10M ABOVE GROUND
    %%%%ADD IN LOOP TO STOP WHEN Y AXIS GOES BELOW ZERO THEN INCREASE
    %%%%INCREMENTS   
%======================================================================%    
  caption = sprintf('Angle = %.2f radians', angle); %Title of graph defined
  title(caption, 'FontSize', 15); %Title of graph inserted
  grid on; %Grid on graph
%======================================================================%

% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);

%======================================================================%

Answer 1

[Sebastian Castro]

Sure. There's an xlim function in MATLAB that lets you set the axes.

For example, to do limits from 0 to 58 you would type

xlim([0 58])

To do axis limits as soon as a ground collision is detected, you could do something like:

% Find all the indices of y that are less than zero
zeroIdx = find(y < 0);

% If there are indices with altitude less than zero, find the first one and set the X axis limits
if ~isempty(zeroIdx) 
  finalPosition = y(zeroIdx(1)); 
  xlim([0 finalPosition])
end

% Set all altitudes less than zero to zero (can't penetrate the ground!)
y(zeroIdx) = 0;

- Sebastian