dspsv example program

This example solves the equations

$A x = b,$

where

$A$ is the symmetric matrix

$A = (\begin{matrix} - 1.81 & 2.06 & 0.63 & - 1.15 \\ 2.06 & 1.15 & 1.87 & 4.20 \\ 0.63 & 1.87 & - 0.21 & 3.87 \\ - 1.15 & 4.20 & 3.87 & 2.07 \end{matrix}) and b = (\begin{matrix} 0.96 \\ 6.07 \\ 8.38 \\ 9.50 \end{matrix}) .$

Example program for dspsv