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OpenSolaris 2009.06 - man page for spline (opensolaris section 1)

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spline(1)				  User Commands 				spline(1)

       spline - interpolate smooth curve

       spline [-aknpx] ...

       spline takes pairs of numbers from the standard input as abcissas and ordinates of a func-
       tion. It produces a similar set, which is approximately equally spaced  and  includes  the
       input set, on the standard output. The cubic spline output (R. W. Hamming, Numerical Meth-
       ods for Scientists and Engineers,2nd ed., 349ff) has two continuous derivatives, and  suf-
       ficiently many points to look smooth when plotted, for example by graph(1).

       -a    Supply  abscissas	automatically (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.

       -k    The constant k used in the boundary value computation

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

	     is set by the next argument. By default k = 0.

       -n    Space output points so that approximately n intervals occur between  the  lower  and
	     upper x limits.  (Default n = 100.)

       -p    Make  output periodic, that is, match derivatives at ends. First and last input val-
	     ues should normally agree.

       -x    Next 1 (or 2) arguments are lower (and upper) x limits.  Normally these  limits  are
	     calculated from the data. Automatic abcissas start at lower limit (default 0).

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Availability		     |SUNWesu			   |

       graph(1), attributes(5)

       R. W. Hamming, Numerical Methods for Scientists and Engineers, 2nd ed.

       When  data is not strictly monotonic in x, spline reproduces the input without interpolat-
       ing extra points.

       A limit of 1000 input points is enforced silently.

SunOS 5.11				   14 Sep 1992					spline(1)
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