1CSA1S(3NCARG)                    NCAR GRAPHICS                   CSA1S(3NCARG)
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NAME

6       CSA1S  -  cubic  spline approximation, simple entry for one-dimensional
7       input
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SYNOPSIS

10       CALL CSA1S (NI, XI, YI, KNOTS, NO, XO, YO, NWRK, WORK, IER)
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DESCRIPTION

13       NI          (integer,input) The number of input data points. It must be
14                   that  NI  .gt. 3 and, depending on the size of KNOTS below,
15                   NI may have to be larger.
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17       XI          (real, input) An array dimensioned for NI containing the  X
18                   coordinates of the input data points.
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20       YI          (real,  input) An array dimensioned for NI containing func‐
21                   tion values at the input XI values, that is, YI(L)  is  the
22                   value of the input function at XI(L) for L=1,NI.
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24       KNOTS       (integer,  input)  The  number  of knots to be used in con‐
25                   structing the approximation spline.  KNOTS must be at least
26                   4.  The larger the value for KNOTS, the closer the approxi‐
27                   mated curve will come to passing through the input function
28                   values.
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30       NO          (integer,  input) The number of values to be calculated for
31                   the output curve.
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33       XO          (real, input) An array dimensioned for NO containing the  X
34                   coordinates of the output curve.
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36       YO          (real,  output)  An array dimensioned for NO containing the
37                   calculated function values for the output curve.
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39       NWRK        (integer, input) The size of the WORK array.  NWRK must  be
40                   at least KNOTS*(KNOTS+3).
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42       WORK        (real, input) A work array dimensioned for NWRK.
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44       IER         (integer,  output)  An  error  return  value.   If  IER  is
45                   returned as 0, then no errors were detected. If IER is non-
46                   zero,  then  refer  to  the man page for csagrid_errors for
47                   details.
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USAGE

50       CSA1S is called to find an approximating cubic  spline  for  one-dimen‐
51       sional input data.  If you want to weight the input data values, calcu‐
52       late derivatives, or handle data sparse areas specially, then you  will
53       need to use CSA1XS.
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ACCESS

56       To use CSA1S, load the NCAR Graphics library ngmath.
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SEE ALSO

59       csagrid, csa1xs, csa1ls, csa1lxs
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61       Complete documentation for Csagrid is available at URL
62       http://ngwww.ucar.edu/ngdoc/ng/ngmath/csagrid/csahome.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                             January 1999                    CSA1S(3NCARG)
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