aspline - Akima spline interpolation

       If you need a continuous second derivative, use spline from the plotutils package instead.

Debian                                            January 1998                                         SPLINE(1)

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 splines.

       Datasets are separated by blank lines.

       aspline - Akima spline interpolation

-aincr, --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 number.

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

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

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

       -v     be verbose,

       -h     print help message on stderr and exit.

spline(1), gnuplot(1).

       H.Akima,ANewMethodofInterpolationandSmoothCurveFittingBasedonLocalProcedures,JournalofAssc.forComp.Mach.,Vol.17,No.4,Oct.1970,pp.589—602

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