dyn_spect_stream::get_extrema

Source: stream/dyn_spect/dyn_spect_stream__get_extrema.pro

 dyn_spect_stream::get_extrema
        Return the extrema of a dynamic spectrum dataset.

 Usage:
        range=strref->get_extrema([keys])

 Keywords:
        zero    If set, then return zeros rather than NaNs when no
                data are present.
        sector  If set, then return extrema for the sectors
                separately.
        only    If set, then only return extrema for the specified
                sector (or NaN if the sector is not present).
        positive If set, then use min_nz instead of min to give a
                positive-definite range

 History:
        Original: 13/8/01; SJT
        Use is_full key to min_nz: 7/6/02; SJT