histogram
Plots a histogram.
Usage Overview:
layerN=histogram colorN=<rrggbb>|red|blue|... transparencyN=0..1 binsizeN=+<width>|-<count> cumulativeN=true|false normN=true|false phaseN=<number> barformN=filled|open|steps|spikes thickN=<pixels> dashN=dot|dash|...|<a,b,...> xN=<num-expr> weightN=<num-expr> inN=<table> ifmtN=<in-format> istreamN=true|false icmdN=<cmds>
All the parameters listed here
affect only the relevant layer,
identified by the suffix
N
.
barformN = filled|open|steps|spikes
(Form)
The available options are:
filled
open
steps
spikes
[Default: filled
]
binsizeN = +<width>|-<count>
(BinSizer)
When setting this value graphically, you can use either the slider to adjust the bin count or the numeric entry field to fix the bin width.
[Default: -20
]
colorN = <rrggbb>|red|blue|...
(Color)
The value may be a six-digit hexadecimal number
giving red, green and blue intensities,
e.g. "ff00ff
" for magenta.
Alternatively it may be the name of one of the
pre-defined colors.
These are currently
red
, blue
, green
, grey
, magenta
, cyan
, orange
, pink
, yellow
, black
, white
.
[Default: ff0000
]
cumulativeN = true|false
(Boolean)
[Default: false
]
dashN = dot|dash|...|<a,b,...>
(float[])
Possible values for dashed lines are
dot
, dash
, longdash
, dotdash
.
You can alternatively supply a comma-separated list
of on/off length values such as
"4,2,8,2
".
icmdN = <cmds>
(ProcessingStep[])
inN
.
The value of this parameter is one or more of the filter
commands described in Section 6.1.
If more than one is given, they must be separated by
semicolon characters (";").
This parameter can be repeated multiple times on the same
command line to build up a list of processing steps.
The sequence of commands given in this way
defines the processing pipeline which is performed on the table.
Commands may alteratively be supplied in an external file,
by using the indirection character '@'.
Thus a value of "@filename
"
causes the file filename
to be read for a list
of filter commands to execute. The commands in the file
may be separated by newline characters and/or semicolons.
ifmtN = <in-format>
(String)
inN
.
The known formats are listed in Section 5.2.1.
This flag can be used if you know what format your
table is in.
If it has the special value
(auto)
(the default),
then an attempt will be
made to detect the format of the table automatically.
This cannot always be done correctly however, in which case
the program will exit with an error explaining which
formats were attempted.
[Default: (auto)
]
inN = <table>
(StarTable)
ifmtN
parameter.
istreamN = true|false
(Boolean)
inN
parameter
will be read as a stream.
It is necessary to give the
ifmtN
parameter
in this case.
Depending on the required operations and processing mode,
this may cause the read to fail (sometimes it is necessary
to read the table more than once).
It is not normally necessary to set this flag;
in most cases the data will be streamed automatically
if that is the best thing to do.
However it can sometimes result in less resource usage when
processing large files in certain formats (such as VOTable).
[Default: false
]
normN = true|false
(Boolean)
[Default: false
]
phaseN = <number>
(Double)
A value of 0 (or any integer) will result in a bin boundary at X=0 (linear X axis) or X=1 (logarithmic X axis). A fractional value will give a bin boundary at that value multiplied by the bin width.
[Default: 0.0
]
thickN = <pixels>
(Integer)
[Default: 2
]
transparencyN = 0..1
(Double)
[Default: 0.0
]
weightN = <num-expr>
(String)
The value is a numeric algebraic expression based on column names as described in Section 10.
xN = <num-expr>
(String)
The value is a numeric algebraic expression based on column names as described in Section 10.