Why can't I plot a simple line???

I am trying to change the limits of my axis, and just draw a line through x = 0. But for some reason if I only specify a solid line in my LineStyle, matlab wont plot anything, if I choose anything else it works fine i.e *,o,>,<.... I will just do a simple example to illustrate my point.

>> figure

>> hold on

>> grid on

>> set(gca,'LineWidth',1)

>> axis([-10,10,0,30]);

>> plot(0,0:1:30,'r-') %% this produces nothing

>> plot(0,0:1:30,'r-*')%% this and everything else does..

>> plot(0,0:1:30,'r-o')

>> plot(0,0:1:30,'r->')

>> plot(0,0:1:30,'r-<')

Any idea why? Any help will be appreciated.

-D

Answer 1

[Mohammad Abouali]

Well, if you change

plot(0,0:1:30,'r-')

to

plot(zeros(1,31),0:1:30,'r-')

it would generate a line.

However, if you want to change your axis limit that is not a proper approach

Use

xlim([minXAxisValue maxXAsixValue])
ylim([minYAxisValue maxYAsixValue])

[daniel]

beautiful, so simple.. I understand perfectly, thanks!

[Mohammad Abouali]

You are welcome

[daniel]

Mohammad, suppose I want to plot a line across y = -15.

plot(0:1:100,-15.*ones(101,1),'r-')

will produce the line but is there a cleaner way of doing this?