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

6       CURVPI - integrate a periodic spline curve
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SYNOPSIS

9       FUNCTION CURVPI (XL, XU, N, X, Y, P, YP, SIGMA)
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11       This  function  calculates  an  integral  between two specified limits.
12       CURVP1 must be called prior to calling  CURVPI,  and  the  values  thus
13       obtained  used  as  input  to  CURVPI.   The  value  of the integral is
14       returned.
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DESCRIPTION

17       XL          (real, input) The lower limit of the integration.
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19       XR          (real, input) The upper limit of the integration.
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21       N           (real, input) The number of input data values. (N > 1)
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23       X           (real, input) An array containing  the  abscissae  for  the
24                   input function.
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26       Y           (real,  input) An array containing the functional values of
27                   the input function -- Y(K) is the (real, input)  functional
28                   value at X(K) for K=1,N.
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30       P           (real, input) The period of the function.
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32       YP          (real, input) Contains values for the second derivative (as
33                   calculated by CURV1).
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35       SIGMA       (real, input) Tension factor. Values near zero result in  a
36                   cubic  spline;  large  values  (e.g. 50) result in nearly a
37                   polygonal line. A typical value is 1.
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RETURN VALUE

40       CURVPI returns the integral of the interpolated curve between the spec‐
41       ified limits.
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ACCESS

44       To use CURVPI, load the NCAR Graphics library ngmath.
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SEE ALSO

47       curv1, fitgrid_params.
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49       Complete documentation for Fitgrid is available at URL
50       http://ngwww.ucar.edu/ngdoc/ng/ngmath/fitgrid/fithome.html
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53       Copyright (C) 2000
54       University Corporation for Atmospheric Research
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56       The use of this Software is governed by a License Agreement.
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60UNIX                              March 1998                    CURVPI(3NCARG)
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