Read theory $2\mathrm{.}1,2\mathrm{.}2$ and $3\mathrm{.}3$ Wave dispersion analysis in auxetic rods by Ramzi Othman and also the matlab codes at the end of Dispersion relations for elastic waves in plates and rods January $2011$

Authors:Feruza Amirkulova San Jose State University$)$and make a PYTHON CODE TO PLOT THE DISPERSION CURVES FOR LONGITUDINAL WAVES IN A ROD. NOTE IIN THE DOCUMENTS THE CUT OF FREQUENCIES AND THE MULTIPLE SOLUTIONS OF THE POCHAMMER EQUATION. USE A STEEL ROD: density $7850$kg$/$m$3$ v$=0\mathrm{.}2$ and E is $200$e$6$Pa$.$ You must plot freq vs wavenumber and freq vs group velocity. Please answer if you are good in programming. include the plot screenshots as well.