I have a 100x4 matrix with coordinates for 100 lines that I'd like to plot in a single plot.
If the matrix name is A, you can use plot(A(:,1),A(:,2),A(:,3),A(:,4)). This will display connected line segments. If you want individual points to be displayed, you can use plot(A(:,1),A(:,2),'+',A(:,3),A(:,4),'+'). To know more plot options, please refer to this page- https://help.scilab.org/docs/5.5.2/en_US/plot.html