Selection functions that accept record arguments (annopen,
isigopen, osigopen, and dbinit) normally close any
active database files of the types with which each deals before
proceeding. The argument +record is synonymous with
record, but has the effect of causing these functions to leave any
active files open. (For convenience, the other functions that accept
record arguments -- sampfreq, newheader, and
setheader -- also treat record and +record as
synonymous, but without any noticeable effect.) The restrictions on the
total numbers of signals and annotation files still apply.
If the sampling frequencies or lengths of the records do not match, a warning
message will be produced (unless dbquiet was invoked). The
time-conversion functions
(see section [ms]timstr)
will continue to use the sampling frequency and base
time defined for the first record that was opened, unless these
attributes are reset by sampfreq, setsampfreq, or
setbasetime.
Function calopen uses the `+' convention for calibration
file names. Although it normally creates the calibration list from
scratch each time it is called, it retains the current calibration list
if the calibration file name is prefixed by `+'.
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