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aspline - Akima spline interpolation


aspline [-a xstep] [-l llim] [-u ulim] [-n n] {file(s)}


aspline reads pairs of numbers from the indicated file(s) (or from stdin if no files were
given) as abscissas and ordinates of a function. It produces a similar set, which is
approximately equally spaced and includes the input set on standard output. The output is
an Akima-interpolated spline which has an continuous first derivative. The second
derivate may be discontinuous, but the output does not wiggle as it would do with cubic

Datasets are separated by blank lines.


-a incr, --auto=incr
supply abscissas automatically, since they are missing from the input; spacing is
given by the next argument, or is assumed to be 1, if next argument is not a

-l llim, --llimit=llim
set lower x-limit to llim,

-u ulim, --ulimit=ulim
set upper x-limit to ulim,

-n n, --points=n
space output points so that approx. n intervals occur between the lower and upper

-v be verbose,

-h print help message on stderr and exit.

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