How to plot vertical lines for reference using vline?

Im using vline and hline unsuccesfully. It seems that doesn't work when i need it. Example:

if true
  x = -10:.2:10; 
  y = sin(x)+2;
plot(x, y)
vline(0, 'k')
hline(0, 'k')
grid minor
axis([-5 5 -5 5])
hold on
y = sin(x) - 2;
plot(x,y)

end

[Matt J]

How so? I see a horizontal and vertical line in that plot.

[Jonas Lara]

Can i redefine the axis of vline? That litle line doesnt looks right

[Pawel Jastrzebski]

Having a quick look at your example - is this what you're trying to achieve?

https://uk.mathworks.com/matlabcentral/fileexchange/63458-matlab-plot-gallery-set-axes-positions?focused=7852119&tab=example

[Jonas Lara]

wow, thank you. It is more than i need, i guess it will work perfectly. Let me try it and come back with a feedback.

Answer 1

[Pawel Jastrzebski]

I've moved my comment to the answer so the question can be closed. I've also tried to copy your example to show you what I think you're trying to achieve:

% DATA
x = -10:.2:10; 
y0 = sin(x);
y1 = y0+2;
y2 = y0-2;

% PLOTTING
f(1) = figure; % create a new figure window
ax(1)= gca();  % handle to the current's figure axis

% Handles to the plot lines.
% Alternatively you could write it as:
% p(1:3) = plot(x, [y0; y1; y2]);

p(1) = plot(x,y0);
hold on
p(2) = plot(x,y1);
p(3) = plot(x,y2);

% USE THE HANDLES TO CHANGE THE PROPERTIES OF THE AXES AND LINES
set(p(1),...
    'LineWidth', 0.5,...
    'LineStyle', '--');

set([p(2) p(3)],...
    'LineWidth', 2,...
    'LineStyle', '-');

set(ax(1),...
    'XAxisLocation','origin',...
    'YAxisLocation','origin',...
    'XLim', [-8 6],...
    'YLim', [-4 2],...
    'XMinorGrid','on',...
    'YMinorGrid','on');

set(ax(1).Title,...
    'String','Sine plots',...
    'Color',[1 0 0],...
    'FontSize',14);

set(ax(1).XLabel,...
    'String', 'X-label');
set(ax(1).YLabel,...
    'String', 'Y-label');
set([ax(1).XLabel ax(1).YLabel],...
    'Color',[0 0 1],...
    'FontSize',12);

Output:

All of the properties that you can change are listed in the following:

• Axes properties
• Line properties