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.TH CSA1S 3NCARG "January 1999" UNIX "NCAR GRAPHICS"
.SH NAME
CSA1S - cubic spline approximation, simple entry for one-dimensional input
.SH SYNOPSIS
CALL CSA1S (NI, XI, YI, KNOTS, NO, XO, YO, NWRK, WORK, IER)
.SH DESCRIPTION
.IP NI 12
(integer,input) The number of input data points. It must be that NI .gt. 3 
and, depending on the size of KNOTS below, NI may have to be larger.
.IP XI 12
(real, input) An array dimensioned for NI containing the X 
coordinates of the input data points.
.IP YI 12
(real, input) An array dimensioned for NI 
containing function values at the input XI values, 
that is, YI(L) is the value of the input function at XI(L) for L=1,NI.
.IP KNOTS 12
(integer, input) The number of knots to be used in constructing 
the approximation spline.  KNOTS must be at least 4.  The larger the value for
KNOTS, the closer the approximated curve will come to passing
through the input function values.
.IP NO 12
(integer, input) The number of values to be calculated for the output curve.
.IP XO 12
(real, input) An array dimensioned for NO 
containing the X coordinates of the output curve.
.IP YO 12
(real, output) An array dimensioned for NO
containing the calculated function values for the output curve.
.IP NWRK 12 
(integer, input) The size of the WORK array.  NWRK must be at least
KNOTS*(KNOTS+3).
.IP WORK 12
(real, input) A work array dimensioned for NWRK.
.IP IER 12
(integer, output) An error return value.  If IER is returned as 0, then
no errors were detected. If IER is non-zero, then refer to the man
page for csagrid_errors for details.
.SH USAGE
CSA1S is called to find an approximating cubic spline for one-dimensional
input data.  If you want to weight the input data values,
calculate derivatives, or handle data sparse areas specially,
then you will need to use CSA1XS.
.SH ACCESS
To use CSA1S, load the NCAR Graphics library ngmath.
.SH SEE ALSO
csagrid,
csa1xs,
csa1ls,
csa1lxs
.sp
Complete documentation for Csagrid is available at URL
.br
http://ngwww.ucar.edu/ngdoc/ng/ngmath/csagrid/csahome.html
.SH COPYRIGHT
Copyright (C) 2000
.br
University Corporation for Atmospheric Research
.br

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