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iso

Set plotting options for the contour line/surface plot.

Synopsis:

iso option=value [,option=value, ...]

Arguments:

option

A plot option for the contour plot. See table below.

value

A value associated with the matching option . See table below.

Option

Value

Value Meaning

Default Value

colors

{contour# color [contour# color ...]}

A list of contour numbers and color names/indices. Color Names This specifies the colors for individual contours.

err

0.0 <= real <= 1.0

Error tolerance for polygon decimation. This allows the user to remove polygons for faster display. The number indicates how far away from coplanar two polygons can be before they are no longer eligible to be collapsed into one polygon. A value of 0.0 will removes nothing, while a value of 1.0 will remove everything. This option applies only to 3D data.

0.0

lc

color or off

Coloring method to use for plot. If the value is off , cycled coloring is used. If the value is a color name or index, solid coloring is used. Color Names

off

legend

on, off

Whether or not a legend should be displayed with the plot.

on

level

list of real numbers

Space-delimited set of numbers to use as actual iso level values. This conflicts with the pct and ­ nlevels options, as explained in the Description section below.

No default

ls

dash, dot,
dotdash, solid

Line style. Line Styles

solid

lt

1 <= integer <= 4

Number to indicate thickness. 1 is the most thin, and 4 is the thickest.

1.0

max

real number, off

Points above this maximum value will be ignored. off indicates the actual data maximum will be used.

off

min

real number, off

Points below this minimum value will be ignored. off indicates the actual data minimum will be used.

off

nlevels

positive integer

Integer number of levels, which will range uniformly from data min to data max of the chosen variable. This conflicts with the level and pct options, as explained in the Description section below.

7

pct

iso percent levels

Space-delimited set of percentages to use for calculating iso levels. This conflicts with the level and ­ nlevels options, as explained in the Description section below.

No default

pop

pop

off

scale

linear, log

Display the legend scale as a linear or log scale. This option only applies when the legend option is on.

linear

var

variable name

Name of variable to plot. If the name is default, then the first appropriate variable found in the current directory of the file will be used.

default

Description:

The iso command sets the options used when generating a contour (i.e., iso) plot. Note that this command does not change existing contour plots, only future ones. If plotting 2D data, the iso plot creates contour lines. If plotting 3D data, the iso plot creates contour surfaces.

The levels to draw are set by either the level , pct , or nlevels option. If more than one of these options is set, the last option "wins". The nelevels option is the default method for level selection.

To find the data value range of a variable, see the minmax command.

Examples:

iso lc=green,var=p, pct=10 25 50 75 90

iso level=0.5 1.0 2.0 5.0

See Also:

colordef , minmax , plot , pc


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