def compute_georange(geomean, geosd, count):
    """Compute the geometric range of one geometric standard deviation around
       the geometric mean.  Return the geometric range."""

    georange = 0.0

    if count > 0:
        if geosd > 0.0:
            georange = geomean * geosd - geomean / geosd
        else:
            georange = 0.0

    return georange