Man Linux: Main Page and Category List


       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 splines.

       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 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.


       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. 589602


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