CURVD – derivatives for 1D functions. Synopsis FUNCTION CURVD (T, N, X, Y, YP, SIGMA) This function calculates a derivative at a specified point using a spline under tension. CURV1 must be called prior to calling CURVD, and the values thus obtained used as input to CURVD. The derivative value is returned. Description T (real,…
CURV2 – 1D interpolation for non-periodic functions. Synopsis FUNCTION CURV2 (T, N, X, Y, YP, SIGMA) This function interpolates a value at a specified point using a spline under tension. CURV1 must be called prior to calling CURV2, and the values thus obtained used as input to CURV2. CURV2 returns the interpolated function value at…
CURV1 – does set-up for CURV2. Synopsis CALL CURV1 (N, X, Y, SLP1, SLPN, ISLPSW, YP, TEMP, SIGMA, IER) Description N (integer,input) The number of input data values. (N > 1) X (real, input) An array containing the abscissae for the input function. Y (real, input) An array containing the functional values of the input…
CUFY – Converts from user coordinates to fractional coordinates. Name spps_converters – A set of functions, each of which transforms a coordinate from one of the NCAR Graphics coordinate systems to another. The complete list of functions is as follows: CFUX, CFUY, CMFX, CMFY, CMUX, CMUY, CPFX, CPFY, CPUX, CPUY, CUFX, CUFY, KFMX, KFMY, KFPX,…
CUFX – Converts from user coordinates to fractional coordinates. Name spps_converters – A set of functions, each of which transforms a coordinate from one of the NCAR Graphics coordinate systems to another. The complete list of functions is as follows: CFUX, CFUY, CMFX, CMFY, CMUX, CMUY, CPFX, CPFY, CPUX, CPUY, CUFX, CUFY, KFMX, KFMY, KFPX,…
CSVOROD – calculate Voronoi polygons for data on a sphere. Synopsis CALL CSVOROD (NPTS, RLATI, RLONI, NI, NF, IWK, RWK, NC, RLATO, RLONO, RC, NCA, NUMV, NV, IER) Description NPTS (integer,input) The number of input data points (NPTS > 3). RLATI (double precision, input) An array containing the latitudes of the input data, expressed in…
CSVORO – calculate Voronoi polygons for data on a sphere. Synopsis CALL CSVORO (NPTS, RLATI, RLONI, NI, NF, IWK, RWK, NC, RLATO, RLONO, RC, NCA, NUMV, NV, IER) Description NPTS (integer,input) The number of input data points (NPTS > 3). RLATI (real, input) An array containing the latitudes of the input data, expressed in degrees….
CSSTRID – calculates a Delaunay triangulation for data on a sphere Synopsis CALL CSSTRID (N, RLAT, RLON, NT, NTRI, IWK, RWK, IER) Description N (integer,input) The number of input data points (N > 2). RLAT (double precision, input) An array containing the latitudes of the input data, expressed in degrees. The first three points must…
CSSTRI – calculates a Delaunay triangulation for data on a sphere Synopsis CALL CSSTRI (N, RLAT, RLON, NT, NTRI, IWK, RWK, IER) Description N (integer,input) The number of input data points (N > 2). RLAT (real, input) An array containing the latitudes of the input data, expressed in degrees. The first three points must not…
CSSGRIDD – tension spline interpolation on a sphere. Synopsis CALL CSSGRIDD (N, RLAT, RLON, F, NI, NJ, PLAT, PLON, FF, IWK, RWK, IER) Description N (integer,input) The number of input data points (N > 2). RLAT (double precision, input) An array containing the latitudes of the input data, expressed in degrees. The first three points…
cssgrid_params – This document briefly describes all the internal parameters of Cssgrid. Description Each entry below includes the name of a parameter, its Fortran type (use the obvious equivalents for C), its default value, and a short description of the parameter. ‘SIG’ – Real – computed value of the tension factor for the splines ‘TOL’…
cssgrid_errors – This document briefly describes all the errors reported from Cssgrid. Description Each entry below includes the error number and its meaning. 1 Invalid number of input points (must be greater than 3). 2 Invalid dimension for latitudes in the output grid. 3 Invalid dimension for longitudes in the output grid. 4 First three…
CSSGRID – tension spline interpolation on a sphere. Synopsis CALL CSSGRID (N, RLAT, RLON, F, NI, NJ, PLAT, PLON, FF, IWK, RWK, IER) Description N (integer,input) The number of input data points (N > 2). RLAT (real, input) An array containing the latitudes of the input data, expressed in degrees. The first three points must…
CSSETR – Sets the value of an internal parameter of type REAL for the Cssgrid package. Synopsis CALL CSSETR (PNAM,RVAL) Description PNAM A character string that specifies the name of the parameter to be set. RVAL A REAL value that is the value to be assigned to the internal parameter specified by PNAM. Usage This…
CSSETI – Sets the value of an internal parameter of type INTEGER. Synopsis CALL CSSETI (PNAM,IVAL) Description PNAM A character string that specifies the name of the parameter to be set. IVAL An INTEGER value that is the value to be assigned to the internal parameter specified by PNAM. Usage This routine allows you to…
CSSETD – Sets the value of an internal parameter of type DOUBLE PRECISION for the Cssgrid package. Synopsis CALL CSSETD (PNAM,DVAL) Description PNAM A character string that specifies the name of the parameter to be set. DVAL A DOUBLE PRECISION value that is the value to be assigned to the internal parameter specified by PNAM….
Cssgrid is a software package in the ngmath library that implements a tension spline interpolation algorithm to fit a function to input data randomly located on the surface of a sphere. There are user-settable parameters that control various aspects of the algorithm, the most important of which is the tension factor that controls the level…
CSS2CD – convert from lat/lon coordinates to Cartesian coordinates. Synopsis CALL CSS2CD (N, RLAT, RLON, X, Y, Z) Description N (integer, input) The number of input lat/lon coordinates. RLAT (double precision, input) An array containing the latitudes of the input coordinates. RLON (double precision, input) An array containing the longitudes of the input coordinates. X…
CSS2C – convert from Cartesian to lat/lon coordinates Synopsis CALL CSS2C (N, RLAT, RLON, X, Y, Z) Description N (integer, input) The number of coordinates to convert. RLAT (real, input) The latitudes of the input coordinates, in degrees. RLON (real, input) The longitudes of the input coordinates, in degrees. X,Y,Z (real, output) The Cartesian coordinates…
CSGETR – Retrieves the value of an internal parameter of type REAL. Synopsis CALL CSGETR (PNAM,RVAL) Description PNAM A character string that specifies the name of the parameter to get. The name must appear as the first three characters of the string. RVAL A REAL variable that is the name of the variable into which…