forked from qutip/qutip
/
utils.py
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/
utils.py
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# This file is part of QuTiP.
#
# QuTiP 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 3 of the License, or
# (at your option) any later version.
#
# QuTiP 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 QuTiP. If not, see <http://www.gnu.org/licenses/>.
#
# Copyright (C) 2011 and later, Paul D. Nation & Robert J. Johansson
#
###########################################################################
import numpy as np
def _reg_str2array(string,width):
"""
Takes a string of 'u','d','0',and '1' and returns
a flattened array of 0's and 1's.
Parameters
----------
string: str
Input string
"""
if len(string)!=width:
raise ValueError('Registers string length is not equal to the registers width.')
mask=[]
for kk in range(len(string)):
if string[kk] in ['u','0']:
mask+=[0]
elif string[kk] in ['d','1']:
mask+=[1]
else:
raise ValueError("String element '"+string[kk]+"' is not a valid label.")
return np.array(mask)