1CURV2(3NCARG)                    NCAR GRAPHICS                   CURV2(3NCARG)
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NAME

6       CURV2 - 1D interpolation for non-periodic functions.
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SYNOPSIS

9       FUNCTION CURV2 (T, N, X, Y, YP, SIGMA)
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11       This  function interpolates a value at a specified point using a spline
12       under tension.  CURV1 must be called prior to calling  CURV2,  and  the
13       values thus obtained used as input to CURV2. CURV2 returns the interpo‐
14       lated function value at the X-coordinate specified.
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DESCRIPTION

17       T           (real, input) The abscissa for which an interpolated  func‐
18                   tion value is desired.
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20       N           (integer, input) The number of input data values. (N > 1)
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22       X           (real,  input)  An  array  containing the abscissae for the
23                   input function.
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25       Y           (real, input) An array containing the functional values  of
26                   the  input data -- Y(K) is the functional value at X(K) for
27                   K=1,N.
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29       YP          (real, input) Contains values for the second derivative (as
30                   calculated by CURV1).
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32       SIGMA       (real,  input) Tension factor. Values near zero result in a
33                   cubic spline; large values (e.g. 50)  result  in  nearly  a
34                   polygonal line. A typical value is 1.
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RETURN VALUE

37       CURV2 returns the interpolated value at the specified point T.
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ACCESS

40       To use CURV2, load the NCAR Graphics library ngmath.
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SEE ALSO

43       curv1, fitgrid_params.
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45       Complete documentation for Fitgrid is available at URL
46       http://ngwww.ucar.edu/ngdoc/ng/ngmath/fitgrid/fithome.html
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49       Copyright (C) 2000
50       University Corporation for Atmospheric Research
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52       The use of this Software is governed by a License Agreement.
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56UNIX                              March 1998                     CURV2(3NCARG)
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