#!/usr/bin/env python
"""
killMS, a package for calibration in radio interferometry.
Copyright (C) 2013-2017  Cyril Tasse, l'Observatoire de Paris,
SKA South Africa, Rhodes University

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import numpy as np

def findrms(mIn,maskSup=1e-7):
    m=mIn[np.abs(mIn)>maskSup]
    rmsold=np.std(m)
    diff=1e-1
    cut=3.
    bins=np.arange(np.min(m),np.max(m),(np.max(m)-np.min(m))/30.)
    med=np.median(m)
    for i in range(10):
        ind=np.where(np.abs(m-med)<rmsold*cut)[0]
        rms=np.std(m[ind])
        if np.abs((rms-rmsold)/rmsold)<diff: break
        rmsold=rms
    return rms
