Plot the sections of a truss structure.
plotsection(t,p,s)
a matrix containing the list of bars. It's a nbars x 2 matrix. First column corresponds to the point number which starts the bar. Second column corresponds to the point number which ends the bar.
a matrix containing the coordinate of the points. It's a npoints x 2 matrix for a 2 dimensions structure and a npoints x 3 for a 3 dimensions structure.
a matrix containing the section of the bars. It's a vector of size nbars.
Plot the sections of a truss structure.