conop3(3NCARG)
NAME
CONOP3 - sets option switches and specifys various REAL parameters to be used by the Conran_family utility.
SYNOPSIS
CALL CONOP3 (IOPT, ARRAY, LENA)
DESCRIPTION
IOPT Character, input -- Selects an internal parameter and sets
an option switch. The possibilities are:
'CHL=ON' or 'CHL=OFF'
'CIL=ON' or 'CIL=OFF'
'CON=ON' or 'CON=OFF'
'DBP=ON' or 'DBP=OFF'
'SDC=ON' or 'SDC=OFF'
'SLD=ON' or 'SLD=OFF'
'TEN=ON' or 'TEN=OFF'
ARRAY Real array, input -- Sets an internal parameter.
LENA Integer, input -- The length of array ARRAY.
If an option is turned 'ON', then the remaining CONOP3
arguments can be used to override the default settings of
that option.
If the option is 'OFF', then the remaining arguments of the
CONOP3 call can be any dummy values. Option settings will
be returned to their default values.
The following options are defined by this subroutine:
CHL This parameter determines how the high and low contour values
are set. These contour values may be set by the program or by
the user. If CHL=OFF, the program examines the user's input
data and determines both the high and low values. If CHL=ON,
the user must specify the desired high (HI) and low (FLO)
values. The default is CHL=OFF.
If program set: CALL CONOP3('CHL=OFF',0.,0)
If user set: CALL CONOP3('CHL=ON',ARRAY,2) where ARRAY(1)=HI,
ARRAY(2)=FLO
Note: The values supplied for contour increment and contour
high and low values assume unscaled data values. See the SDC
parameter, below.
CIL This parameter determines how the contour increment (CINC) is
set. The increment is either calculated by the program
(CIL=OFF) using the range of high and low values from the
user's input data, or set by the user (CIL=ON). The default is
CIL=OFF.
If program set: CALL CONOP3('CIL=OFF',0.,0)
If user set: CALL CONOP3('CIL=ON',CINC,1)
Note: By default, ('CIL=OFF') the program will examine the
user's input data and determine the contour interval (CINC) at
some appropriate range between the level of high and low values
supplied, usually generating between 15 and 20 contour levels.
Example: CALL CONOP3('CIL=ON',10.,1)
will generate contours at increments of 10. units in user
coordinates.
CON This parameter determines how the contour levels are set. If
CON=ON, the user must specify an array of contour values and
the number of contour levels. A maximum of NCL=30 contour
levels is permitted. If CON=OFF, NCL and the contour values
are computed. The default is OFF.
If program set: CALL CONOP3('CON=OFF',0.,0)
If user set: CALL CONOP3('CON=ON',ARRAY,NCL)
Note: The real array (ARRAY) must have the contour levels
ordered from smallest to largest.
Warning: It is illegal to use the CON option when either CIL or
CHL are activated. If this is done, the option call that
detected the error will not be executed.
DBP This parameter determines how the dash pattern break point (BP)
is set. (Does not apply to entry CONRAQ.) If DBP=ON, BP must
be set by the user. If DBP=OFF, the program will set BP to 0.
This is the default.
If program set: CALL CONOP3('DBP=OFF',0.,0)
If user set: CALL CONOP3('DBP=ON',BP,1)
Note: BP is a floating point number where the break for GTR and
LSS contour dash patterns are defined. BP is assumed to be
given relative to the untransformed contours.
To see how various dash line patterns can be assigned to
various contours see parameter DBP in "man conop4".
SDC The parameter to determine how to scale the input data from
which the contours are generated. (Does not apply to entry
CONRAQ.) If SDC=ON, the scaling factor is set to ARRAY(1). If
SDC=OFF, the default scale factor of 1. is used.
If program set: CALL CONOP3('SDC=OFF',0.,0)
If user set: CALL CONOP3('SDC=ON',ARRAY,1)
Note: The data plotted on contour lines and the data plotted
for relative minimums and maximums will be scaled by ARRAY.
SLD Input a polygon to define the extent of area to be contoured.
(Does not apply to entry CONRAQ.) When this option is
activated, only those contours within the shield are drawn.
The shield is a polygon specified by the user which must be
given in the same coordinate range as the the data. It must
define only one polygon.
To input a shield:
CALL CONOP3('SLD=ON',ARRAY,LENA)
Otherwise:
CALL CONOP3('SLD=OFF',0.,0)
Note: ARRAY is a real array LENA elements long. The first
LENA/2 elements are X coordinates and the second LENA/2
elements are Y coordinates. This polygon must be closed, that
is the first and last points in ARRAY must be the same.
Example:
DIMENSION SHLD(10)
DATA SHLD/ 7.,10.,10.,7.,7.,
1 7.,7.,10.,10.,7./
CALL CONOP3 ('SLD=ON',SHLD,10)
TEN The parameter to determine the tension factor applied when
smoothing contour lines using splines under tension. (Does not
apply to entry CONRAQ.) If user set, the allowed range is from
greater than zero to 30. The higher the tension the less
smoothing occurs. The default value (TEN=OFF) is 2.5.
If program set: CALL CONOP3('TEN=OFF',0.,0)
If user set: CALL CONOP3('TEN=ON',TENS,1)
Note: This option is not available in the standard version of
CONRAN.
USAGE
CONOP3 is called to set parameters of type REAL 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 CONOP3 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, conop2, 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.
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