Use of coordinates to plot a figure as shown

I am trying to make a plot of some coordinates that represent each node in the system and get the lines drawn as shown in the figure. Making a plot for the coordinates is no problem, writing a script that can make the lines, im clueless.

Thank you

[Doug Hull]

It looks like you have done it.

You will need to tell us how the connectivity data is stored. My guess is you have a matrix holding the XY data, and a second matrix storing the connectivity of the nodes. Please explain what this format is.

[Simen]

The lines on the picture is drawn "by hand" postprocess.

NodeCoordinates = [0 0;500 0;500 500;1000 0;0 500] (xy for node 1 2 3...)

ElementNodes = [ 1 2 ; 1 3 ; 2 3 ; 2 4 ; 3 4 ; 5 3 ] (connectivity of each node)

So when extracting the different x and y values I use:

xx = NodeCoordinates(:,1)

yy = NodeCoordinates(:,2)

Answer 1

[Kelly Kearney]

The gplot function is probably the easiest way to do this:

   xy = NodeCoordinates;
   ee = ElementNodes;
   n = size(xy,1);
   adj = sparse(ee(:,1), ee(:,2), ones(size(ee,1),1), n,n);

   gplot(adj, xy);
   hold on;
   plot(xy(:,1), xy(:,2), 'k.');