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-.\" ========================================================================
-.\"
-.IX Title "funcolumnactivate 3"
-.TH funcolumnactivate 3 "April 14, 2011" "version 1.4.5" "SAORD Documentation"
-.SH "NAME"
-FunColumnActivate \- activate Funtools columns
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-.Vb 1
-\& #include <funtools.h>
-.Ve
-.PP
-.Vb 1
-\& void FunColumnActivate(Fun fun, char *s, char *plist)
-.Ve
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-The \fB\f(BIFunColumnActivate()\fB\fR routine determines which columns (set up
-by \fIFunColumnSelect()\fR)
-ultimately will be read and/or written. By default, all columns that
-are selected using
-\&\fIFunColumnSelect()\fR
-are activated. The
-\&\fIFunColumnActivate()\fR
-routine can be used to turn off/off activation of specific columns.
-.PP
-The first argument is the Fun handle associated with this set of
-columns. The second argument is a space-delimited list of columns to
-activate or de\-activate. Columns preceded by \*(L"+\*(R" are activated and
-columns preceded by a \*(L"\-\*(R" are de\-activated. If a column is named
-without \*(L"+\*(R" or \*(L"\-\*(R", it is activated. The reserved strings \*(L"$region\*(R"
-and '$n' are used to activate a special columns containing the filter
-region value and row value, respectively, associated with
-this row. For example, if a filter containing two circular regions is
-specified as part of the Funtools file name, this column will contain
-a value of 1 or 2, depending on which region that row was in. The
-reserved strings \*(L"$x\*(R" and \*(L"$y\*(R" are used to activate the current
-binning columns. Thus, if the columns \s-1DX\s0 and \s-1DY\s0 are specified as
-binning columns:
-.PP
-.Vb 1
-\& [sh $] fundisp foo.fits[bincols=(DX,DY)]
-.Ve
-.PP
-then \*(L"$x\*(R" and \*(L"$y\*(R" will refer to these columns in a call to
-\&\fIFunColumnActivate()\fR.
-.PP
-In addition, if the activation string contains only columns to be
-activated, then the routine will de-activate all other columns.
-Similarly, if the activation string contains only
-columns to de\-activate, then the routine will activate all other columns
-before activating the list. This makes it simple to change the
-activation state of all columns without having to know all of the
-column names. For example:
-.IP "\(bu" 4
-\&\fB\*(L"pi pha time\*(R"\fR # only these three columns will be active
-.IP "\(bu" 4
-\&\fB\*(L"\-pi \-pha \-time\*(R"\fR # all but these columns will be active
-.IP "\(bu" 4
-\&\fB\*(L"pi \-pha\*(R"\fR # only pi is active, pha is not, others are not
-.IP "\(bu" 4
-\&\fB\*(L"+pi \-pha\*(R"\fR # same as above
-.IP "\(bu" 4
-\&\fB\*(L"pi \-pha \-time\*(R"\fR # only pi is active, all others are not
-.IP "\(bu" 4
-\&\fB\*(L"pi pha\*(R"\fR # pha and pi are active, all others are not
-.IP "\(bu" 4
-\&\fB\*(L"pi pha \-x \-y\*(R"\fR # pha and pi are active, all others are not
-.PP
-You can use the column activation list to reorder columns, since
-columns are output in the order specified. For example:
-.PP
-.Vb 9
-\& # default output order
-\& fundisp snr.ev'[cir 512 512 .1]'
-\& X Y PHA PI TIME DX DY
-\& -------- -------- -------- -------- --------------------- -------- --------
-\& 512 512 6 7 79493997.45854475 578 574
-\& 512 512 8 9 79494575.58943175 579 573
-\& 512 512 5 6 79493631.03866175 578 575
-\& 512 512 5 5 79493290.86521725 578 575
-\& 512 512 8 9 79493432.00990875 579 573
-.Ve
-.PP
-.Vb 9
-\& # re-order the output by specifying explicit order
-\& fundisp snr.ev'[cir 512 512 .1]' "time x y dy dx pi pha"
-\& TIME X Y DY DX PI PHA
-\& --------------------- -------- -------- -------- -------- -------- --------
-\& 79493997.45854475 512 512 574 578 7 6
-\& 79494575.58943175 512 512 573 579 9 8
-\& 79493631.03866175 512 512 575 578 6 5
-\& 79493290.86521725 512 512 575 578 5 5
-\& 79493432.00990875 512 512 573 579 9 8
-.Ve
-.PP
-A \*(L"+\*(R" sign by itself means to activate all columns, so that you can reorder
-just a few columns without specifying all of them:
-.PP
-.Vb 9
-\& # reorder 3 columns and then output the rest
-\& fundisp snr.ev'[cir 512 512 .1]' "time pi pha +"
-\& TIME PI PHA Y X DX DY
-\& --------------------- -------- -------- -------- -------- -------- --------
-\& 79493997.45854475 7 6 512 512 578 574
-\& 79494575.58943175 9 8 512 512 579 573
-\& 79493631.03866175 6 5 512 512 578 575
-\& 79493290.86521725 5 5 512 512 578 575
-\& 79493432.00990875 9 8 512 512 579 573
-.Ve
-.PP
-The column activation/deactivation is performed in the order of the
-specified column arguments. This means you can mix \*(L"+\*(R", \*(L"\-\*(R" (which
-de-activates all columns) and specific column names to reorder and
-select columns in one command. For example, consider the following:
-.PP
-.Vb 9
-\& # reorder and de-activate
-\& fundisp snr.ev'[cir 512 512 .1]' "time pi pha + \-x \-y"
-\& TIME PI PHA DX DY
-\& --------------------- -------- -------- -------- --------
-\& 79493997.45854475 7 6 578 574
-\& 79494575.58943175 9 8 579 573
-\& 79493631.03866175 6 5 578 575
-\& 79493290.86521725 5 5 578 575
-\& 79493432.00990875 9 8 579 573
-.Ve
-.PP
-We first activate \*(L"time\*(R", \*(L"pi\*(R", and \*(L"pha\*(R" so that they are output first.
-We then activate all of the other columns, and then de-activate \*(L"x\*(R" and \*(L"y\*(R".
-Note that this is different from:
-.PP
-.Vb 9
-\& # probably not what you want ...
-\& fundisp snr.ev'[cir 512 512 .1]' "time pi pha \-x \-y +"
-\& TIME PI PHA Y X DX DY
-\& --------------------- -------- -------- -------- -------- -------- --------
-\& 79493997.45854475 7 6 512 512 578 574
-\& 79494575.58943175 9 8 512 512 579 573
-\& 79493631.03866175 6 5 512 512 578 575
-\& 79493290.86521725 5 5 512 512 578 575
-\& 79493432.00990875 9 8 512 512 579 573
-.Ve
-.PP
-Here, \*(L"x\*(R" and \*(L"y\*(R" are de\-activated, but then all columns including \*(L"x\*(R" and
-\&\*(L"y\*(R" are again re\-activated.
-.PP
-Typically,
-\&\fIFunColumnActivate()\fR uses a
-list of columns that are passed into the program from the command line. For
-example, the code for funtable contains the following:
-.PP
-.Vb 1
-\& char *cols=NULL;
-.Ve
-.PP
-.Vb 3
-\& /* open the input FITS file */
-\& if( !(fun = FunOpen(argv[1], "rc", NULL)) )
-\& gerror(stderr, "could not FunOpen input file: %s\en", argv[1]);
-.Ve
-.PP
-.Vb 3
-\& /* set active flag for specified columns */
-\& if( argc >= 4 ) cols = argv[3];
-\& FunColumnActivate(fun, cols, NULL);
-.Ve
-.PP
-The \fIFunOpen()\fR call sets the
-default columns to be all columns in the input file. The
-\&\fIFunColumnActivate()\fR call
-then allows the user to control which columns ultimately will be
-activated (i.e., in this case, written to the new file). For example:
-.PP
-.Vb 1
-\& funtable test.ev foo.ev "pi pha time"
-.Ve
-.PP
-will process only the three columns mentioned, while:
-.PP
-.Vb 1
-\& funtable test.ev foo.ev "\-time"
-.Ve
-.PP
-will process all columns except \*(L"time\*(R".
-.PP
-If \fIFunColumnActivate()\fR
-is called with a null string, then the environment variable
-\&\fB\s-1FUN_COLUMNS\s0\fR will be used to provide a global value, if present.
-This is the reason why we call the routine even if no columns
-are specified on the command line (see example above), instead
-of calling it this way:
-.PP
-.Vb 4
-\& /* set active flag for specified columns */
-\& if( argc >= 4 ){
-\& FunColumnActivate(fun, argv[3], NULL);
-\& }
-.Ve
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-See funtools(7) for a list of Funtools help pages