1KURVP1(3NCARG)                   NCAR GRAPHICS                  KURVP1(3NCARG)
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NAME

6       KURVP1 - calculate values for KURVP2 usage
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SYNOPSIS

9       CALL KURVP1 (N, X, Y, XP, YP, TEMP, S, SIGMA, IER)
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11       This  subroutine  calculates  certain values that are used by KURVP2 in
12       order to compute  an  interpolatory  spline  under  tension  through  a
13       sequence  of  points  in the plane that form a closed curve. The actual
14       computation of the interpolated values must be done using KURVP2 .
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DESCRIPTION

17       N           (integer,input) The number of input data points. (N > 1)
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19       X           (real,input) An  array  containing  the  X  values  of  the
20                   points.
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22       Y           (real,input)  An  array  containing  the  Y  values  of the
23                   points. Adjacent pairs of points must be distinct.
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25       XP          (real,output) An array of length N.
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27       YP          (real,output) An array of length N.
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29       TEMP        (real,input) Scratch space.
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31       S           (real,output) An array of length N (this will  be  used  to
32                   pass to KURVP2).
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34       SIGMA       (real,input)  Tension  factor. Values near zero result in a
35                   cubic spline; large values (e.g. 50)  result  in  nearly  a
36                   polygonal line. A typical value is 1.
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38       IER         (integer,output)  An error return value. If IER is returned
39                   as 0, then no errors were detected.
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41                   = 1 if N is less than 2.
42                   = 2 if a pair of adjacent points coincide.
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ACCESS

45       To use KURVP1, load the NCAR Graphics library ngmath.
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SEE ALSO

48       kurvp2, fitgrid_params.
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50       Complete documentation for Fitgrid is available at URL
51       http://ngwww.ucar.edu/ngdoc/ng/ngmath/fitgrid/fithome.html
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54       Copyright (C) 2000
55       University Corporation for Atmospheric Research
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57       The use of this Software is governed by a License Agreement.
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61UNIX                              March 1998                    KURVP1(3NCARG)
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