Can't get graph to work properly

Hi, I'm new to building general functions on Matlab and am having trouble getting this one to work. My goal is to write a simple general function where the user can input two points and have a line drawn through them, as well as have the slope displayed. However, my points are not being graphed correctly and I cannot figure out why. If anyone could take a look and see where I went wrong, I would appreciate it.

My code is:

function simple_plot(t0,tf,r,t) %A simple plotting function, where t0 is initial point, tf is final point, %r is desired range and t is title. %Please enter t0,tf, range and title. plot([t0],[tf]) a=t0; b=tf; x1=a(1,1); x2=b(1,1); y1=a(1,2); y2=b(1,2); m = ((y2-y1)./(x2-x1)); slope = ['The slope of the line is: ',num2str(m)]; disp(slope) axis([r]); title(t) end

[Nate Ellingson]

function simple_plot(t0,tf,r,t) 
%A simple plotting function, where t0 is initial point, tf is final point, 
%r is desired range and t is title. 
%Please enter t0,tf, range and title. 

plot([t0],[tf]) 
a=t0; 
b=tf; 
x1=a(1,1); 
x2=b(1,1); 
y1=a(1,2); 
y2=b(1,2); 
m = ((y2-y1)./(x2-x1)); 
slope = ['The slope of the line is: ',num2str(m)]; 
disp(slope) 
axis([r]); 
title(t) 
end

Answer 1

[Nate Ellingson]

plot needs an x vector and a y vector, not two points. so you'ld need to do something like this

plot([t0(1) tf(1)], [t0(2) tf(2)]);

[manta24]

That worked perfectly, thank you!