nag_monotonic_intg (e01bhc) evaluates the definite integral of a piecewise cubic Hermite interpolant over the interval .
nag_monotonic_intg (e01bhc) evaluates the definite integral of a piecewise cubic Hermite interpolant, as computed by
nag_monotonic_interpolant (e01bec), over the interval
.
The function is derived from routine PCHIA in
Fritsch (1982).
The computational error in the value returned for
integral should be negligible in most practical situations.
Not applicable.
The time taken by nag_monotonic_intg (e01bhc) is approximately proportional to the number of data points included within the interval .
This example program reads in values of
n,
x,
f and
d. It then reads in pairs of values for
a and
b, and evaluates the definite integral of the interpolant over the interval
until end-of-file is reached.