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How to plot vertical lines for reference using vline?

Asked by Jonas Lara on 23 Apr 2018
Latest activity Edited by Pawel Jastrzebski on 24 Apr 2018
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

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

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1 Answer

Answer by Pawel Jastrzebski on 24 Apr 2018
Edited by Pawel Jastrzebski on 24 Apr 2018

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:

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