ultrix man page for spline

spline(1g)																spline(1g)

Name
       spline - interpolate smooth curve

Syntax
       spline [option...]

Description
       The  command  takes  pairs of numbers from the standard input as abcissas and ordinates of a function.  It produces a similar set, which is
       approximately equally spaced and includes the input set, on the standard output.  The cubic spline output has two  continuous  derivatives,
       and a sufficient number of points to look smooth when plotted.

Options
       The following options are recognized, each as a separate argument.

       -a Supplies abcissa automatically and uses specified number (next argument) for spacing.  Default is 1.

       -k Sets the boundary constant to the specified value (next argument).  By default k = 0.  For example,

						      (2nd deriv. at end) = k*(2nd deriv. next to end)

       -n Uses specified number (n) in calculating intervals between lower and upper limits.  (Default n = 100.)

       -p Periodically produces output (matches derivates at ends).  First and last input values should normally agree.

       -x Uses	specified  numbers  (next  arguments)  as  lower and upper limits.  Normally these limits are calculated from the data.  Automatic
	  abcissas start at lower limit (default 0).

Restrictions
       A limit of 1000 input points is enforced silently.

Diagnostics
       When data is not strictly monotone in x, reproduces the input without interpolating extra points.

See Also
       graph(1g), plot(1g)

																	spline(1g)