NAME

       CONOP2 - sets option switches and specifys various INTEGER parameters to be used by the
       Conran_family utility.

SYNOPSIS

       CALL CONOP2 (IOPT, IVAL)

DESCRIPTION

       IOPT        Character, input -- Selects an internal parameter and sets an option switch.
                   The possibilities are:

                    'INT=OFF', 'INT=ALL', 'INT=MAJ', 'INT=MIN', 'INT=LAB', 'INT=DAT'
                    'LSZ=ON' or 'LSZ=OFF'
                    'NCP=ON' or 'NCP=OFF'
                    'SML=ON' or 'SML=OFF'
                    'SPD=ON' or 'SPD=OFF'
                    'SSZ=ON' or 'SSZ=OFF'
                    'STL=ON' or 'STL=OFF'

       IVAL        Integer, input -- Sets an internal parameter.

                   If IOPT is not 'OFF', then the IVAL argument is used to override the default
                   setting of that option.

                   If IOPT is 'OFF', the IVAL argument can have any dummy value.  Option settings
                   will be returned to their default values.

                   The following options are defined by this subroutine:

       INT     The parameter to determine the intensities of the contour lines and other parts of
               the plot.  If INT=OFF, all intensities are set to the default values.  If INT=ALL,
               all intensities are set to IVAL.  If INT is set to one of the other possible
               options (MAJ, MIN, LAB or DAT), the intensity level for that option is set to
               IVAL.

               If program set: CALL CONOP2('INT=OFF',0)

               All the same:  CALL CONOP2('INT=ALL',IVAL)

               Major lines:  CALL CONOP2('INT=MAJ',IVAL)

               Minor lines:  CALL CONOP2('INT=MIN',IVAL)

               Title and message:  CALL CONOP2('INT=LAB',IVAL)

               Data values:  CALL CONOP2('INT=DAT',IVAL)

               Note: 'INT=DAT' relates to the plotted data values and the plotted maximums and
               minimums.

               Note: IVAL is the intensity desired.  IVAL values range from 0 to 255.

               Example:   CALL CONOP2('INT=ALL',110)

       LSZ     This parameter determines the label size.  (Does not apply to entry CONRAQ.)  The
               value of LSZ is the desired length in NDCs multiplied by 1023.  If LSZ=ON, the
               label size is set to IVAL.  If LSZ=OFF, the default label size is 9./1023.  NDCs.

               Example: CALL CONOP2('LSZ=ON',12)

       NCP     The parameter to indicate the number of data points used for the partial
               derivative estimation.  If NCP=OFF, IVAL is set to 4, which is the default value.
               If NCP=ON, the user must specify IVAL greater than or equal to 2.

               Example:  CALL CONOP2('NCP=ON',2)

               Note: IVAL = number of data points used for estimation.  Changing this value
               affects the contours produced and the size of input array IWK.

       SML     The parameter to determine the size of minimum and maximum contour labels in
               integer scaled NDC units.  (Does not apply to entry CONRAQ.)  The value of SML is
               the desired length in NDCs multiplied by 1023.  If SML=OFF, the default label size
               is 15./1023. NDCs.  If SML=ON, the user must specify IVAL.

               Example: CALL CONOP2('SML=ON',12)

       SPD     The parameter for the size of the plotted input data values in integer scaled NDC
               units.  If SPD=OFF, the default label size is 8./1023. NDCs.  If SPD=ON, the user
               must specify IVAL.

               Example: CALL CONOP2('SPD=ON',12)

       SSZ     The parameter to determine the resolution (number of steps in each direction).  If
               SSZ=ON, the user sets IVAL, or, if SSZ=OFF, the program will automatically set
               IVAL to the default value of 40.

               Warning:  The scratch array (7th argument in the CONRAN call) must be dimensioned
               IVAL**2 or larger.

               Example:

                     DIMENSION SCR(10000)
                     CALL CONOP2('SSZ=ON',100)
                     CALL CONRAN(XD,YD,ZD,NDP,WK,IWK,SCR)

               Note: IVAL is an integer specifying the density of the virtual grid.  In most
               cases, the default value of 40 produces pleasing contours.  For coarser but
               quicker contours, lower the value.  For smoother contours at the expense of taking
               a longer time, raise the value.

               Warning:  For step sizes greater than 200 in CONRAN, the arrays PV in common block
               CONRA1 and ITLOC in common block CONRA9, must be expanded to about 10 more than
               IVAL.

       STL     The parameter to determine the character size of the main title in integer scaled
               NDC units.  If STL=OFF, the default label size is 16./1023. NDCs.  If STL=ON, the
               user must specify IVAL.

               Example: CALL CONOP2('STL=ON',14)

               Note: When 30 or 40 characters are used for the title, the default size of 16
               integer scaled NDC units works well.  For longer titles, a smaller title size is
               required.

USAGE

       CONOP2 is called to set parameters of type INTEGER before CONRAN, CONRAQ, or CONRAS are
       called to generate the contour plot.

EXAMPLES

       Use the command ncargex to see the following examples: tconaq, tconan, and tconas.

ACCESS

       To use CONOP2 load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably
       in that order.

MESSAGES

       See the conran_family man page for a description of all Conran_family error messages
       and/or informational messages.

SEE ALSO

       Online: conran_family, conran_family_params, conran, conraq, conras, conop1, conop3,
       conop4, conpack, conpack_params

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

COPYRIGHT

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