How to plot vertical line in octave?

octave line-plot
Austin A picture Austin A · Sep 7, 2014 · Viewed 16.9k times · Source

What it the best way to plot a vertical line using Octave?

Answer

Austin A picture Austin A · Sep 7, 2014

So, I have two methods for this. One, I found, and the other I made up.

Method 1: From here.

%% Set x value where verticle line should intersect the x-axis.
x = 0;
%% plot a line between two points using plot([x1,x2],[y1,y2])
plot([x,x],[-10,10]);

Method 2: A slightly different approach, exact same result

%% Setup a vector of x values
x = linspace(0,0,100);
%% Setup a vector of y values
y = linspace(0,10,100);
%% Plot the paired points in a line
plot(x,y);

I think Method 2 may write more information to memory before the plot process and it's a line longer, so in my eyes, Method 1 should be the better option. If you prefer Method 2, make sure your x and y vectors are the same dimension or you'll end up with a bunch of dots where you're line should be.

Related questions

Differences between Octave and MATLAB?

I'm a programmer who knows Python, Ruby and some C who is trying to decide whether to learn GNU Octave or Matlab. I know that they have a lot in common, but it isn't clear to me how similar the …

Read More
How to concat string + i?

for i=1:N f(i) = 'f'+i; end gives an error in MatLab. What's the correct syntax to initialize an array with N strings of the pattern fi? It seems like even this is not working: for i=1:4 f(i) = …

Read More
Octave/Matlab: Adding new elements to a vector

Having a vector x and I have to add an element (newElem) . Is there any difference between - x(end+1) = newElem; and x = [x newElem]; ?

Read More