Ubuntu Manpage: FunEnv - Funtools Environment Variables

Provided by: libfuntools-dev_1.4.8-1.1build2_amd64

NAME

       FunEnv - Funtools Environment Variables

SYNOPSIS

       Describes the environment variables which can be used to tailor the overall Funtools environment.

DESCRIPTION

The following environment variables are supported by Funtools:

• FITS_EXTNAME

The FITS_EXTNAME environment variable specifies the default FITS extension name when FunOpen() is
called on a file lacking a primary image. Thus,

setenv FITS_EXTNAME "NEWEV"

will allow you to call FunOpen() on files without specifying NEWEV in the Funtools bracket
specification. If no FITS_EXTNAME variable is defined and the extension name also is not passed in
the bracket specification, then the default will be to look for standard X-ray event table extension
names "EVENTS" or "STDEVT" (we are, after all, and X-ray astronomy group at heart!).

• FITS_EXTNUM

The FITS_EXTNUM environment variable specifies the default FITS extension number when FunOpen() is
called on a file lacking a primary image. Thus,

setenv FITS_EXTNUM 7

will allow you to call FunOpen() on files to open the seventh extension without specifying the number
in the Funtools bracket specification.

• FITS_BINCOLS and EVENTS_BINCOLS

These environment variable specifies the default binning key for FITS binary tables and raw event
files, respectively. They can be over-ridden using the bincols=[naxis1,naxis2] keyword in a Funtools
bracket specification. The value of each environment variable is a pair of comma-delimited columns,
enclosed in parentheses, to use for binning. For example, if you want to bin on detx and dety by
default, then use:

setenv FITS_BINCOLS "(detx,dety)"

in preference to adding a bincols specification to each filename:

foo.fits[bincols=(detx,dety)]

• FITS_BITPIX and EVENTS_BITPIX

These environment variable specifies the default bitpix value for binning FITS binary tables and raw
event files, respectively. They can be over-ridden using the bitpix=[value] keyword in a Funtools
bracket specification. The value of each environment variable is one of the standard FITS bitpix
values (8,16,32,-32,-64). For example, if you want binning routines to create a floating array, then
use:

setenv FITS_BITPIX -32

in preference to adding a bitpix specification to each filename:

foo.fits[bitpix=-32]

• ARRAY

The ARRAY environment variable specifies the default definition of an array file for Funtools. It is
used if there is no array specification passed in the ARRAY() directive in a Non-FITS Array
specification. The value of the environment variable is a valid array specification such as:

setenv ARRAY "s100.150"
foo.arr[ARRAY()]

This can be defined in preference to adding the specification to each filename:

foo.arr[ARRAY(s100.150)]

• EVENTS

The EVENTS environment variable specifies the default definition of an raw event file for Funtools.
It is used if there is no EVENTS specification passed in the EVENTS() directive in a Non-FITS EVENTS
specification. The value of the environment variable is a valid EVENTS specification such as:

setenv EVENTS "x:J:1024,y:J:1024,pi:I,pha:I,time:D,dx:E:1024,dx:E:1024"
foo.ev[EVENTS()]

This can be defined in preference to adding the specification to each filename:

foo.ev[EVENTS(x:J:1024,y:J:1024,pi:I,pha:I,time:D,dx:E:1024,dx:E:1024)]

The following filter-related environment variables are supported by Funtools:

• FILTER_PTYPE

The FILTER_PTYPE environment variable specifies how to build a filter. There are three possible
methods:

• process or p

The filter is compiled and linked against the funtools library (which must therefore be
accessible in the original install directory) to produce a slave program. This program is fed
events or image data and returns filter results.

• dynamic or d (gcc only)

The filter is compiled and linked against the funtools library (which must therefore be
accessible in the original install directory) to produce a dynamic shared object, which is loaded
into the funtools program and executed as a subroutine. (Extensive testing has shown that,
contrary to expectations, this method is no faster than using a slave process.)

• contained or c

The filter and all supporting region code is compiled and linked without reference to the
funtools library to produce a slave program (which is fed events or image data and returns filter
results). This method is slower than the other two, because of the time it takes to compile the
region filtering code. It is used by stand-alone programs such as ds9, which do not have access
to the funtools library.

By default, dynamic is generally used for gcc compilers and process for other compilers. However the
filter building algorithm will check for required external files and will use contained is these are
missing.

• FUN_MAXROW

The FUN_MAXROW environment variable is used by core row-processing Funtools programs (funtable,
fundisp, funcnts, funhist, funmerge, and funcalc) to set the maximum number of rows read at once
(i.e. it sets the third argument to the FunTableRowGet() call). The default is 8192. Note that this
variable is a convention only: it will not be a part of a non-core Funtools program unless code is
explicitly added, since each call to FunTableRowGet() specifies its own maximum number of rows to
read. NB: if you make this value very large, you probably will need to increase FUN_MAXBUFSIZE (see
below) as well.

• FUN_MAXBUFSIZE

The FUN_MAXBUFSIZE environment variable is used to limit the max buffer size that will be allocated
to hold table row data. This buffer size is calculated to be the row size of the table multiplied by
the maximum number of rows read at once (see above). Since the row size is unlimited (and we have
examples of it being larger than 5 Mb), it is possible that the total buffer size will exceed the
machine capabilities. We therefore set a default value of 5Mb for the max buffer size, and adjust
maxrow so that the total size calculated is less than this max buffer size. (If the row size is
greater than this max buffer size, then maxrow is set to 1.) This environment variable will change
the max buffer size allowed.

• FILTER_CC

The FILTER_CC environment variable specifies the compiler to use for compiling a filter
specification. You also can use the CC environment variable. If neither has been set, then gcc will
be used if available. Otherwise cc is used if available.

• FILTER_EXTRA

The FILTER_EXTRA environment variable specifies extra options to add to a filter compile command
line. In principle, you can add libraries, include files, and compiler switches. This variable should
be used with care.

• FILTER_TMPDIR

The FILTER_TMPDIR environment variable specifies the temporary directory for filter compilation
intermediate files. You also can use the TMPDIR and TMP variables. By default, /tmp is used as the
temporary directory.

• FILTER_KEEP

The FILTER_KEEP environment variable specifies whether the intermediate filter files (i.e. C source
file and compile log file) should be saved after a filter is built. The default is "false", so that
these intermediate files are deleted. This variable is useful for debugging, but care should be taken
to reset its value to false when debugging is complete.

NAME

SYNOPSIS

DESCRIPTION

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