How to change the density of a demo model?

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lovematlab el 7 de Mzo. de 2017

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https://es.mathworks.com/matlabcentral/answers/328552-how-to-change-the-density-of-a-demo-model

Hi, I am trying to understand a SimMechanics demo. When the demo is loaded, a .m file which stores the values for some parameters are loaded. There is a section at the top of the file which defines the Material Properties. It states: density = simmechanics.demohelpers.densities;

When I double clicked a Solid in the model, under Inertia it states that it is based on the Density and the Density is rho. I cannot find rho being defined in the .m file.

Please let me know how to change the density to aluminum.