NAME

       aspline - Akima spline interpolation

SYNOPSIS

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

DESCRIPTION

       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.

OPTIONS

       -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 number.

       -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 limit,

       -v     be verbose,

       -h     print help message on stderr and exit.

SEE ALSO

       spline(1), gnuplot(1).

       H. Akima, A New Method of Interpolation and Smooth Curve Fitting Based on Local  Procedures,  Journal  of
       Assc. for Comp. Mach., Vol. 17, No. 4, Oct. 1970, pp. 589—602

BUGS

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