1## libCEED: Basic Examples 2 3Two examples are provided that rely only upon libCEED without any external libraries. 4 5### Example 1: ex1-volume 6 7This example uses the mass matrix to compute the length, area, or volume of a region, depending upon runtime parameters. 8 9### Example 2: ex2-surface 10 11This example uses the diffusion matrix to compute the surface area of a region, in 1D, 2D or 3D, depending upon runtime parameters. 12 13### Example 3: ex3-volume 14 15This example uses the mass matrix to compute the length, area, or volume of a region, depending upon runtime parameters. 16Unlike ex1, this example also adds the diffusion matrix to add a zero contribution to this calculation while demonstrating the ability of libCEED to handle multiple basis evaluation modes on the same input and output vectors. 17