Evaluate numerical solution of PDE using output of pdepe

`[uout,duoutdx] = pdeval(m,x,ui,xout)`

| Symmetry of the problem: slab = |

| A vector [ |

| A vector `xmesh` ,
where `sol` is the solution returned by `pdepe` . |

| A vector of points from the interval [ |

`[uout,duoutdx] = pdeval(m,x,ui,xout)`

approximates
the solution *u _{i}* and its
partial derivative ∂

`x0`

,`xn`

].
The `pdeval`

function returns the computed values
in `uout`

and `duoutdx`

, respectively.
x rather
than the flux f. Although the flux is continuous,
the partial derivative may have a jump at a material interface. |

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