# ncl_cssgrid_params man page

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´ - Real - 0.01
- Tolerance to use in calculating gradient differences to terminate the iteration sequence when computing global gradients
- ´TTF´ - Real - 0.01
- Tolerance to use in determining how accurately each tension factor should be calculated to approximate its optimum value
- ´NLS´ - Integer - 10
- Number of nodes to use in the least squares fit.
- ´NSG´ - Integer - 10
- Maximum number of iterations to use in the algorithm for computing automatic tension factors
- ´ISG´ - Integer - 0
- Flag to revert to calculating automatic tension factors rather than use a constant tension. Using a constant tension is effected by setting a value for the control parameter sig. If isg is 0, then a tension array is used, otherwise a constant tension is used.
- ´IGR´ - Integer - 1
- Flags whether global or local gradients are used (1 implies global, anything else implies local).
- ´MVL´ - Real - -8.
- Fill value to use in returns for NCL functions. Used only if mvl has been changed from its default.

## See Also

cssgrid, csstri, csvoro, css2c, csc2s, csseti, csgeti, cssetr, csgetr, cssetd, csgetd, cssgridd, csstrid, csvorod, css2cd, csc2sd, c_cssgrid, c_csstri, c_csvoro, c_css2c, c_csc2s, c_csseti, c_csgeti, c_cssetr, c_csgetr, c_cssetd, c_csgetd, c_cssgridd, c_csstrid, c_csvorod, c_css2cd, c_csc2sd. Complete documentation for Cssgrid is available at URL

http://ngwww.ucar.edu/ngdoc/ng/ngmath/c…

## Copyright

Copyright (C) 2000

University Corporation for Atmospheric Research

The use of this Software is governed by a License Agreement.