The sfsmisc Package - NexTag Supports Open Source Initiatives
The sfsmisc Package - NexTag Supports Open Source Initiatives
The sfsmisc Package - NexTag Supports Open Source Initiatives
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34 inv.seq<br />
Arguments<br />
x<br />
fx<br />
a,b<br />
use.spline<br />
xtol<br />
abscissa values.<br />
corresponding values of f(x).<br />
the boundaries of integration; these default to min(x) and max(x) respectively.<br />
logical; if TRUE use an interpolating spline.<br />
tolerance factor, typically around sqrt(.Machine$double.eps) ......(fixme)....<br />
Details<br />
Note that this is really not good for noisy fx values; probably a smoothing spline should be used in<br />
that case.<br />
Also, we are not yet using Romberg in order to improve the trapezoid rule. This would be quite an<br />
improvement in equidistant cases.<br />
Value<br />
the approximate integral.<br />
Author(s)<br />
Martin Maechler, May 1994 (for S).<br />
See Also<br />
integrate for numerical integration of functions.<br />
Examples<br />
x