rdann - read a WFDB annotation file
rdann -r record -a annotator
[ options ... ]
rdann reads the annotation file specified by record
and annotator, and writes a text-format translation of it on the standard
output, one annotation per line. The output contains (from left to right)
the time of the annotation in hours, minutes, seconds, and milliseconds;
the time of the annotation in samples; a mnemonic for the annotation type;
the annotation subtyp, chan, and num fields; and the auxiliary information
string, if any (assumed to be a null-terminated ASCII string).
- -c chan
- Print only those annotations with chan fields that match chan.
- Print annotation times as elapsed times from the beginning of the record
(default: rdann prints absolute times if the absolute time of the beginning
of the record is defined, and elapsed times otherwise, unless the -x option
has been given).
- -f time
- Begin at the specified time. By default, rdann starts
at the beginning of the record; if modification labels are present, they
are not printed unless -f 0 is given explicitly, however.
- Print a usage
- -n num
- Print only those annotations with num fields that match num.
- -p type [ type ... ]
- Print annotations of the specified types only. The type
arguments should be annotation mnemonics (e.g., N) as normally printed by
rdann in the third column. More than one -p option may be used in a single
command, and each -p option may have more than one type argument following
it. If type begins with ‘‘-’’, however, it must immediately follow -p (standard
annotation mnemonics do not begin with ‘‘-’’, but modification labels in an
annotation file may define such mnemonics).
- -s sub
- Print only those annotations
with subtyp fields that match sub.
- -t time
- Stop at the specified time.
- Use an alternate time format for output (the first three
columns are the elapsed times in seconds, in minutes, and in hours, replacing
the hh:mm:ss and sample number columns in the default output). Note that
this format is incompatible with wrann.
The -f and -t options may be used
to select a portion of an annotation file for printing. Their arguments
are usually given in standard time (hh:mm:ss) format; see the description
of strtim in the WFDB Programmer’s Guide, as well as the comments below,
for other formats.
Annotation numbers beginning with 0 are implicitly assigned
by rdann to each annotation in an annotation file, and beat numbers beginning
with 0 are assigned to each QRS annotation. If the argument of the -f option
begins with ‘a’, it is taken to be the annotation number of the first annotation
to be printed; if it begins with ‘b’, it is taken to be the beat number of
the first beat annotation to be printed (any non-QRS annotations that immediately
precede this annotation are also printed). Arguments of the -t option beginning
with ‘a’ or ‘b’ similarly specify the annotation number or beat number following
the last to be printed. If the argument of the -t option begins with ‘#’,
it is taken as the number of QRS annotations to be processed; note that
not all of those processed will necessarily be printed, if the -p option
is used to select only a subset of annotation types to be printed.
that the -e and -x options are mutually exclusive; if both are given, only
the last one is effective.
It may be necessary to set and export
the shell variable WFDB (see setwfdb(1)
rdann -a atr -r 200 -f 0 -t 5:0 -p V
This command prints on the standard output all V (premature ventricular
contraction) annotations in the first five minutes of the atr (reference
annotation) file for record 200.
The first edition of the
MIT-BIH Arrhythmia Database CD-ROM, the first and second editions of the
European ST-T Database CD-ROM, and the first edition of the MIT-BIH Polysomnographic
Database CD-ROM contain versions of rdann that use an older command syntax
(still supported by the current version but not described here). Refer
to bin.doc in the CD-ROM directory that contains rdann for further information.
This program is provided in the app directory of the WFDB
Software Package. Run make in that directory to compile and install it
if it have not been installed already.
The PhysioNet ATM (http://physionet.org/cgi-bin/ATM)
provides web access to rdsamp (select Show annotations as text from the
George B. Moody
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Updated 26 January 2018