SETUSV - sets the value of one of the internal parameters of SPPS.

       To  use SETUSV or c_setusv, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in
       that order.

       The C-binding argument descriptions are the same as the FORTRAN argument descriptions.

       #include <ncarg/ncargC.h>

       void c_setusv (char *vn, int iv)

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.

UNIX                                               March 1993                                     SETUSV(3NCARG)

       VN          (an  input constant or variable of type CHARACTER) is the name of a parameter; only the first
                   two characters are meaningful.  Remember that, in FORTRAN, a constant of type CHARACTER is  a
                   string of characters enclosed in apostrophes.

       IV          (an input expression of type INTEGER) is the desired new value of the parameter identified by
                   VN, as described in the following table:

                   Parameter   Description               Possible Values of IV
                   Name (VN)
                   ---------   -----------               ---------------------
                    'LS'       Axis scaling              1 = linear X, linear Y
                               ("Log Scaling" flag)      2 = linear X, log Y
                                                         3 = log X,    linear Y
                                                         4 = log X,    log Y

                    'MI'       Axis direction reversal   1 = neither X nor Y
                               ("MIrroring" flag - axis  2 = X, but not Y
                               from maximum to minimum   3 = Y, but not X
                               rather than min to max)   4 = both X and Y

                    'MU'       Metacode output Unit      2

                    'PB'       Pen-move Buffer size      2 to 50

                   Both  'LS' and 'MI' are normally set by calling the routine SET, but can be set independently
                   by calling SETUSV.

                   The parameter 'MU' is set, prior to calling OPNGKS, to change the FORTRAN logical unit number
                   to be used by GKS for metacode output.

                   The parameter 'PB' sets the size of the SPPS polyline  buffer.   The  value  "2"  effectively
                   turns buffering off.

                   Obsolete    Description
                   parameters
                   ----------  -----------
                    'XF'       X axis exponent for plotter coordinates
                               (The PAU range would be 1 to 2**XF - 1 in X)
                    'YF'       Y axis exponent for plotter coordinates
                               (The PAU range would be 1 to 2**YF - 1 in Y)
                    'IR'       Red color intensity (relative to green and blue)
                    'IG'       Green color intensity (relative to red and blue)
                    'IB'       Blue color intensity (relative to red and green)
                    'IM'       Maximum color index to be used
                    'IN'       Overall color intensity
                    'II'       Restore color index
                    'LW'       Line width scale factor in thousandths
                               (2000 means double the default line width)
                    'MS'       Marker size in thousandths
                               (2000 means double the default marker size)

                   The values of the parameters 'XF' and 'YF' are the same as the values of the arguments IX and
                   IY in calls to the routines SETI and GETSI.

                   The parameters 'IR', 'IG', 'IB', 'IM', 'IN', and 'II' were all part of a color-setting scheme
                   meant  to  allow  overall  intensity  to  be  set independently of color.  This scheme is now
                   obsolete; it has been replaced by normal GKS color setting through the routines GSCR, GSPLCI,
                   GSFACI, GSPMCI, and GSTXCI.  The corresponding GKS  inquiry  routines  to  determine  current
                   color  settings are GQCR, GQPLCI, GQFACI, GQPMCI, and GQTXCI.  See Section 6 of "User's Guide
                   for NCAR GKS-0A Graphics."

                   The parameter 'LW' is replaced by the GKS line width scale factor routine, GSLWSC, which  has
                   the corresponding query function GQLWSC.

                   The parameter 'MS' is replaced by the GKS marker size scale factor routine, GSMKSC, which has
                   the corresponding query function GQMKSC.

       Use the ncargex command to see the following relevant examples: (none).

       SETUSV - sets the value of one of the internal parameters of SPPS.

       Online: gscr,gsplci, gsfaci, gspmci, gstxci, gsmksc, gslwsc, spps, spps_params,  getset,  getsi,  getusv,
       plotif, set, setsi, ncarg_cbind

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version; User's Guide for NCAR GKS-0A Graphics

       CALL SETUSV (VN,IV)