rate_stream::get_yscale

Source: stream/rate/rate_stream__get_yscale.pro

 rate_stream::get_yscale
        Return the "natural" Y-scaling for a rates stream.

 Usage:
        scale = strref -> get_scaling(<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
        logarithmic     If set, then return whether this is a log or
                linear plot

 Notes:
        For most streams, this is just a wrapper for the get_extrema
        method, with an _extra key swallower.
 History:
        Original: 10/7/00; SJT
        Use the yscale values: 11/7/00; SJT
        Add logarithmic keyword: 9/10/00