Why is xlim not working?

Hello! I am new to Matlab and am working on my first major assignment. I have a code that does almost everything I want, but my xlim is not properly setting my x axis limit. I initially had the xlim after the hold on function, but it did not format for the entire run. I now have it after the first plots and after every ginput() (as that was the fix i was recommended). It currently starts off with the incorrect x axis, and then formats to the range i want, but I would like it to fit within my range from beginning to end. What is the issue with my script that is causing this issue, and what can I do to fix it?

i attatched my script to this as a file. all help is appreciated!

[Lorie Ann]

i should add that my dsired range for the x-axis is 0 to 12, but when i run the script it starts from -6 and goes to 12.

Answer 1

[Matt J]

Calling axis equal triggers an xlim,ylim adjustment.

% Set parameters for main circle
center = [3,6];
radius = 2;
angleStart = 0;
angleEnd = 2*pi;
circleAngle = linspace( angleStart, angleEnd); % Creates range of angle values

% Calculate x and y values
x = center(1) + radius * cos(circleAngle);
y = center(2) + radius * sin(circleAngle);
 
% PLot main circle

plot(x,y, "b", "LineWidth", 1.5); axis equal;

hold on;
plot(3,6, "bx", "LineWidth", 1.5); % Plot center x
xlim([0, 12]);
ylim([0, 12]);

 % Prevents ellipses shape

grid on; % Applies grid to figure

% Prompt user for description location
disp(" "); % Added to improve readibility in command window
disp("Select location for circle description:");
[x1,y1] = ginput(1);


% Display text description
text(x1,y1, "center at (" + center(1) + "," + center(2) + ")");

% Prompt user for endpoint
disp(" ");
disp(" Select endpoint for line between description and circle:");
[x2, y2] = ginput(1); 

% Draw line between description and circle
plot([x1, x2], [y1, y2], 'b-.'); 

% Repeat for second circle

center2 = [6,2];
radius2 = 0.90;

x2 = center2(1) + radius2 * cos(circleAngle);
y2 = center2(2) + radius2 * sin(circleAngle);

plot(x2, y2, "m", "LineWidth", 3);
plot(6, 2, "mx", "LineWidth", 1.5);

disp(" "); 
disp("Select location for circle description:");
[x3,y3] = ginput(1);


text(x3,y3, "center at (" + center2(1) + "," + center2(2) + ")");

disp(" ");
disp(" Select endpoint for line between description and circle:");
[x4, y4] = ginput(1);

plot([x3, x4], [y3, y4], 'm-.'); 

[Lorie Ann]

This is so good to know! I could not remove axis equal; entirely because doing so warped my circles, but I moved it to come before xlim and ylim and it fixed the issue! Thank you so much!

[Matt J]

You're welcome, but please Accept-click the answer to indicate that it resolved your question.