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NAME spline.4 - cubic-spline
interpolator user function
SYNOPSIS fn spline.4 [+s|-s]
[[n=]npts] [f=from]
[t=to]
DESCRIPTION The function spline.4 creates
data points at evenly spaced intervals using a cubic spline
algorithm to interpolate new points from the old. The
interpolated points lie on a cubic polynomial between each pair
of original points. Each polynomial section is joined
continuously with the next via continuous first and second
derivatives.
The default from and
to values are the first and last values of
x in the original data. If you don't enter any
arguments, you will be prompted for the number of points and the
range to interpolate over.
The +s and -s options turn the
sorting and merging of data actions on and off. Data
must be in increasing order, by x, for the spline to
succeed. Also, x values must be
distinct. Turning the sort off saves time for splining
presorted data. The default is no sort.
The spline.4 function turns off error-bar mode,
and error-bar values are set to zero.
SEE ALSO
eb
fn
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... Meeting the software needs of scientists since 1985 ...
Last Formatted Oct 29, 2000
Last Updated 09/13/95
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