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       This  documentation  is  free  software; you can redistribute it and/or
57       modify it under the terms of the GNU General  Public  License  as  pub‐
58       lished  by  the  Free  Software  Foundation;  either  version  2 of the
59       License, or (at your option) any later version.
60
61       This software is distributed in the hope that it will  be  useful,  but
62       WITHOUT  ANY  WARRANTY;  without  even  the  implied  warranty  of MER‐
63       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  General
64       Public License for more details.
65
66       You should have received a copy of the GNU General Public License along
67       with this software; if not, write  to  the  Free  Software  Foundation,
68       Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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73UNIX                              March 1998                    CURVPI(3NCARG)
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