may be used in conjunction with either d03pdf/d03pda
. It computes the solution and its first derivative at user-specified points in the spatial coordinate.
is an interpolation routine for evaluating the solution of a system of partial differential equations (PDEs), or the PDE components of a system of PDEs with coupled ordinary differential equations (ODEs), at a set of user-specified points. The solution of a system of equations can be computed using d03pdf/d03pda
on a set of mesh points; d03pyf
can then be employed to compute the solution at a set of points other than those originally used in d03pdf/d03pda
. It can also evaluate the first derivative of the solution.
Polynomial interpolation is used between each of the break-points
. When the derivative is needed (
), the array
must not contain any of the break-points, as the method, and consequently the interpolation scheme, assumes that only the solution is continuous at these points.
the arguments u
must be supplied unchanged from either d03pdf/d03pda
If on entry
, explanatory error messages are output on the current error message unit (as defined by x04aaf