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.