Shell Example: Scordelis-Lo Roof
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model.m         defines the model, used by all other scripts

roof.m          performs one analysis
                 - asks for element type and number of intervals
                 - computes displacements, stresses and stress resultants

roof_loop.m     loops over a set of number of intervals
                 - asks for element type and list of number of intervals
                 - computes displacements
                 - plots and prints convergence history
                 - creates csv-file with convergence history

plot_loop.m     plots two different convergence histories using the
                csv-files created by roof_loop

roof_compare.m  compares stress resultants obtained with s3 and with
                s4 elements
