1CURV1(3NCARG)                    NCAR GRAPHICS                   CURV1(3NCARG)
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NAME

6       CURV1 - does set-up for CURV2.
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SYNOPSIS

9       CALL CURV1 (N, X, Y, SLP1, SLPN, ISLPSW, YP, TEMP, SIGMA, IER)
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DESCRIPTION

12       N           (integer,input) The number of input data values. (N > 1)
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14       X           (real,  input)  An  array  containing the abscissae for the
15                   input function.
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17       Y           (real, input) An array containing the functional values  of
18                   the input data -- (Y(K) is the functional value at X(K) for
19                   K=1,N).
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21       SLP1        (real, input) A user-specified value for the desired  slope
22                   at X(1).  See ISLPSW below if you want to have a value cal‐
23                   culated internally.
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25       SLPN        (real, input) A user-specified value for the desired  slope
26                   at X(N).  See ISLPSW below if you want to have a value cal‐
27                   culated internally.
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29       ISLPSW      (integer, input) A switch to indicate whether the slopes at
30                   the end points should be calculated internally.
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32                   = 0 if SLP1 and SLPN are user-specified.
33                   =  1 if SLP1 is user-specified, but SLPN is internally cal‐
34                   culated.
35                   = 2 if SLPN is user-specified, but SLP1 is internally  cal‐
36                   culated.
37                   = 3 if SLP1 and SLPN are internally calculated.
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40       YP          (real,  output)  Contains  values for the second derivative
41                   (CURV1 computes these).
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43       TEMP        (real, input) Scratch space.
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45       SIGMA       (real, input) Tension factor. Values near zero result in  a
46                   cubic  spline;  large  values  (e.g. 50) result in nearly a
47                   polygonal line.  A typical value is 1.
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49       IER         (integer, output) An error return value. If IER is returned
50                   as 0, then no errors were detected.
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52                   = 1 if N is less than 2.
53                   = 2 if X values are not strictly increasing.
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ACCESS

56       To use CURV1, load the NCAR Graphics library ngmath.
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SEE ALSO

59       curv2, fitgrid_params.
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61       Complete documentation for Fitgrid is available at URL
62       http://ngwww.ucar.edu/ngdoc/ng/ngmath/fitgrid/fithome.html
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65       Copyright (C) 2000
66       University Corporation for Atmospheric Research
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68       This  documentation  is  free  software; you can redistribute it and/or
69       modify it under the terms of the GNU General  Public  License  as  pub‐
70       lished  by  the  Free  Software  Foundation;  either  version  2 of the
71       License, or (at your option) any later version.
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73       This software is distributed in the hope that it will  be  useful,  but
74       WITHOUT  ANY  WARRANTY;  without  even  the  implied  warranty  of MER‐
75       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  General
76       Public License for more details.
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78       You should have received a copy of the GNU General Public License along
79       with this software; if not, write  to  the  Free  Software  Foundation,
80       Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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85UNIX                              March 1998                     CURV1(3NCARG)
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