Matlab graphing/plotting problem

[sara_87]

Homework Statement

i have 4 points,
(8,0)
(4,-4)
(-4,4)
(-8,0)
i want to draw a graph of this on MATLAB so that the first to points are joined, the last two points are joined, but i want it on the same graph.
how do i do this? what's the command?
thank you

 

[soiTios]

Alright, so you're learning to use Matlab... :)
Your first two coordinates are: (8,0) and (4,-4)
These coordinates are in the form (X,Y).
so make an array with your X data and an array with your Y data like this:
X1=[8 4]; Y1=[0 -4];
Then get Matlab to plot it by using the plot command:
plot(X1,Y1)

Do the same for the other pair of coordinates...

Altogether, it will look like this: (just cut and paste.. and it should work)

%start
X1=[8 4]; Y1=[0 -4];
X2=[-4 -8]; Y2=[4 0];

plot(X1,Y1,...
X2,Y2);
%end

 

[oswaler]

To plot these points on the same graph in MATLAB, you can use the "plot" function. For example, if you have stored the x-values in a vector named "x" and the y-values in a vector named "y", you can use the command "plot(x,y)" to plot the points. To join the first two points, you can use the "line" function with the coordinates (8,0) and (4,-4). Similarly, you can use the "line" function to join the last two points with the coordinates (-4,4) and (-8,0). You can add these lines to your plot by using the "hold on" command before plotting the lines. This will allow you to plot multiple lines on the same graph. I hope this helps.