Source code for sknano.structures._extras
# -*- coding: utf-8 -*-
"""
===============================================================================
Extra helper functions (:mod:`sknano.structures._extras`)
===============================================================================
.. currentmodule:: sknano.structures._extras
"""
from __future__ import absolute_import, division, print_function, \
unicode_literals
__docformat__ = 'restructuredtext en'
import importlib
import numbers
import re
import numpy as np
from sknano.core.math import comparison_symbol_operator_mappings
__all__ = ['cmp_Ch', 'filter_Ch', 'filter_Ch_list', 'generate_Ch_list',
'generate_Ch_property_grid', 'get_Ch_indices',
'get_chiral_type', 'get_Ch_type',
'map_Ch', 'chiral_type_name_mappings', 'CHIRAL_TYPES',
'filter_key_type_mappings', 'attr_units', 'attr_symbols',
'attr_strfmt', 'type_check_chiral_indices',
'get_chiral_indices', 'get_chiral_indices_from_str']
chiral_type_name_mappings = \
{'achiral': 'aCh', 'armchair': 'AC', 'zigzag': 'ZZ', 'chiral': 'Ch'}
CHIRAL_TYPES = list(chiral_type_name_mappings.keys()) + \
list(chiral_type_name_mappings.values())
filter_key_type_mappings = {}
filter_key_type_mappings['Ch_type'] = str
for k in ('even', 'odd'):
filter_key_type_mappings[k + '_only'] = bool
for k in ('min_index', 'max_index',
'min_n', 'max_n',
'min_m', 'max_m',
'n', 'm'):
filter_key_type_mappings[k] = int
attr_units = {}
attr_units['dt'] = \
attr_units['rt'] = \
attr_units['Ch'] = \
attr_units['T'] = \
attr_units['bond'] = ' \u212B'
attr_units['chiral_angle'] = '\u00b0'
attr_symbols = {}
attr_symbols['t1'] = 't\u2081'
attr_symbols['t2'] = 't\u2082'
attr_symbols['chiral_angle'] = '\u03b8c'
attr_strfmt = {}
attr_strfmt['Ch'] = \
attr_strfmt['T'] = \
attr_strfmt['dt'] = \
attr_strfmt['rt'] = \
attr_strfmt['chiral_angle'] = '{:.2f}'
attr_strfmt['bond'] = '{:.3f}'
[docs]def cmp_Ch(Ch1, Ch2):
"""Custom comparator function for sorting chirality lists.
Parameters
----------
Ch1, Ch2 : {str, tuple}
2-tuple or 2-tuple string of integers
Returns
-------
int
"""
if isinstance(Ch1, tuple) and isinstance(Ch2, tuple):
n1, m1 = Ch1
Ch1_type = get_Ch_type(Ch1)
n2, m2 = Ch2
Ch2_type = get_Ch_type(Ch2)
elif isinstance(Ch1, str) and \
isinstance(Ch2, str):
n1, m1 = get_chiral_indices_from_str(Ch1)
Ch1_type = get_Ch_type(Ch1)
n2, m2 = get_chiral_indices_from_str(Ch2)
Ch2_type = get_Ch_type(Ch2)
if Ch1_type == 'armchair' and Ch2_type == 'zigzag':
return 1
elif Ch1_type == 'zigzag' and Ch2_type == 'armchair':
return -1
else:
if n1 > n2:
return 1
elif n1 < n2:
return -1
else:
if m1 > m2:
return 1
elif m1 < m2:
return -1
else:
return 0
[docs]def filter_Ch(Ch, even_only=False, odd_only=False, Ch_type=None,
min_index=None, max_index=None, min_n=None, max_n=None,
min_m=None, max_m=None, **kwargs):
"""Filter for testing if chirality satisfies given constraint parameters.
Parameters
----------
Ch : {str, tuple}
even_only, odd_only : bool, optional
Ch_type : {None, 'armchair', 'zigzag', 'achiral', 'chiral'}, optional
min_index, max_index : int, optional
min_n, max_n : int, optional
min_m, max_m : int, optional
Returns
-------
bool
"""
if isinstance(Ch, tuple):
this_Ch_type = get_Ch_type(Ch)
n, m = Ch
else:
n, m = get_chiral_indices_from_str(Ch)
this_Ch_type = get_Ch_type(Ch)
if even_only:
if n % 2 == 0 and m % 2 == 0:
return True
else:
return False
elif odd_only:
if this_Ch_type != 'zigzag':
if n % 2 != 0 and m % 2 != 0:
return True
else:
return False
else:
if max(n, m) % 2 != 0:
return True
else:
return False
elif Ch_type is not None:
if this_Ch_type in ('armchair', 'zigzag'):
if Ch_type in ('achiral', 'aCh') or \
(Ch_type in ('armchair', 'AC') and
this_Ch_type == 'armchair') or \
(Ch_type in ('zigzag', 'ZZ') and
this_Ch_type == 'zigzag'):
return True
else:
return False
elif Ch_type in ('chiral', 'Ch') and this_Ch_type == 'chiral':
return True
else:
return False
elif min_index is not None and isinstance(min_index, int):
if this_Ch_type != 'zigzag':
if n >= min_index and m >= min_index:
return True
else:
return False
else:
if max(n, m) >= min_index:
return True
else:
return False
elif max_index is not None and isinstance(max_index, int):
if n <= max_index and m <= max_index:
return True
else:
return False
else:
return True
[docs]def filter_Ch_list(Ch_list, property_filters=None, **kwargs):
"""Filter list of chiralities.
Parameters
----------
Ch_list : sequence
list of chiralities
property_filters : sequence, optional
kwargs : dict, optional
dictionary of conditions to test each chirality against.
Returns
-------
:class:`python:list`
filtered `Ch_list`
"""
# Ch_list = np.asarray(Ch_list)
if property_filters is not None:
from ._swnt import SWNT
filtered_list = Ch_list[:]
try:
for filter_index, (prop, cmp_symbol, value) in \
enumerate(property_filters, start=1):
cmp_op = comparison_symbol_operator_mappings[cmp_symbol]
tmp_list = []
for Ch in filtered_list:
n, m = Ch
nanotube = SWNT(n=n, m=m)
try:
if cmp_op(getattr(nanotube, prop), value):
tmp_list.append(Ch)
except AttributeError:
break
filtered_list = tmp_list[:]
except ValueError as e:
print(e)
finally:
Ch_list = filtered_list[:]
return [Ch for Ch in Ch_list if filter_Ch(Ch, **kwargs)]
[docs]def generate_Ch_list(ns=None, ni=None, nf=None, dn=None,
ms=None, mi=None, mf=None, dm=None,
imax=None, chiral_types=None, handedness=None,
echo_zsh_str=False):
"""Generate a list of :math:`(n, m)` chiralities.
Parameters
----------
ns, ms : sequence
list of :math:`n` and :math:`m` chiral indices.
ni, nf, dn : int, optional
:math:`(n_i, n_f, \\Delta n)` denote the `start`, `stop`, and
`step` parameters passed to the numpy function `np.arange`,
to generate an array of evenly spaced :math:`n` chiral indices.
`ni` only required if `ns` sequence kwarg is `None`.
mi, mf, dm : int, optional
:math:`(m_i, m_f, \\Delta m)` denote the `start`, `stop`, and
`step` parameters passed to the numpy function `np.arange`,
to generate an array of evenly spaced :math:`m` chiral indices.
`mi` only required if `ms` sequence kwarg is `None`.
imax : int, optional
maximum chiral index :math:`n = m = i_{max}`.
chiral_types : {'all', 'achiral', 'chiral', 'armchair', 'zigzag'}, optional
handedness : {'all', 'left', 'right'}, optional
echo_zsh_str : bool, optional
Returns
-------
Ch_list : sequence
list of chiralities
"""
Ch_list = []
if imax is not None:
nf = mf = imax
try:
if (not ns or (isinstance(ns, list) and ns[0] is None)) \
and not ni and not nf and \
(not ms or (isinstance(ns, list) and ms[0] is None)) \
and not mi and not mf:
raise TypeError('ns or [ni,] nf[, dn,] and/or '
'ms or [mi,] mf[, dm,] must be specified')
if not ns and isinstance(ms, list) and ms[0] is not None and \
not ni and not nf and not mi and not mf:
ns = ms[:]
ms = None
elif not ns and (not ms or isinstance(ms, list) and ms[0] is None) \
and not ni and not nf and \
(isinstance(mi, int) or isinstance(mf, int)):
ni = mi
nf = mf
mi = mf = None
if not dn and isinstance(dm, int):
dn = dm
dm = None
if not ns and (isinstance(ni, int) or isinstance(nf, int)):
try:
ns = np.arange(ni, nf + 1, dn, dtype=int).tolist()
except TypeError:
try:
ni, nf, dn = int(float(ni)), int(float(nf)), int(float(dn))
ns = np.arange(ni, nf + 1, dn, dtype=int).tolist()
except (TypeError, ValueError):
try:
ni, nf = int(float(ni)), int(float(nf))
ns = np.arange(ni, nf + 1, dtype=int).tolist()
except (TypeError, ValueError):
try:
nf = int(float(nf))
ns = np.arange(nf + 1, dtype=int).tolist()
except (TypeError, ValueError):
ns = [int(float(ni))]
if (not ms or isinstance(ms, list) and ms[0] is None) and \
not mi and not mf:
for n in ns:
m = 0
while m <= n:
if (m == 0) or (m == n):
Ch_list.append((n, m))
else:
if handedness == 'left':
Ch_list.append((m, n))
elif handedness == 'right':
Ch_list.append((n, m))
else:
Ch_list.append((n, m))
Ch_list.append((m, n))
m += 1
elif (not ms or isinstance(ms, list) and ms[0] is None) and \
(isinstance(mi, int) or isinstance(mf, int)):
try:
ms = np.arange(mi, mf + 1, dm, dtype=int).tolist()
except TypeError:
try:
mi, mf, dm = int(float(mi)), int(float(mf)), int(float(dm))
ms = np.arange(mi, mf + 1, dm, dtype=int).tolist()
except (TypeError, ValueError):
try:
mi, mf = int(float(mi)), int(float(mf))
ms = np.arange(mi, mf + 1, dtype=int).tolist()
except (TypeError, ValueError):
try:
mf = int(float(mf))
ms = np.arange(mf + 1, dtype=int).tolist()
except (TypeError, ValueError):
ms = [int(float(mi))]
except (TypeError, ValueError):
Ch_list = None
else:
if len(Ch_list) == 0 and isinstance(ms, list) and len(ms) != 0:
for n in ns:
for m in ms:
if (n == 0) and (m == 0):
break
elif (n == 0) or (m == 0):
nm = (n, m)
mn = (m, n)
if handedness == 'left':
if m != 0 and nm not in Ch_list:
Ch_list.append(nm)
elif handedness == 'right':
if n != 0 and nm not in Ch_list:
Ch_list.append(nm)
else:
if nm not in Ch_list:
Ch_list.append(nm)
if mn not in Ch_list:
Ch_list.append(mn)
elif (n == m) and (n, m) not in Ch_list:
Ch_list.append((n, m))
else:
nm = (n, m)
mn = (m, n)
if handedness == 'left':
if n < m and nm not in Ch_list:
Ch_list.append(nm)
elif handedness == 'right':
if n > m and nm not in Ch_list:
Ch_list.append(nm)
else:
if nm not in Ch_list:
Ch_list.append(nm)
if mn not in Ch_list:
Ch_list.append(mn)
finally:
if echo_zsh_str and Ch_list is not None:
print(' '.join([repr(str(Ch)) for Ch in Ch_list]))
if chiral_types is not None:
if not isinstance(chiral_types, list):
chiral_types = [chiral_types]
chiral_types = chiral_types[:]
if any([chiral_type in CHIRAL_TYPES for chiral_type in
chiral_types]):
if 'achiral' in chiral_types or 'aCh' in chiral_types:
if 'armchair' not in chiral_types:
chiral_types.append('armchair')
if 'zigzag' not in chiral_types:
chiral_types.append('zigzag')
Ch_list = [Ch for Ch in Ch_list
if get_Ch_type(Ch) in chiral_types]
return Ch_list
[docs]def generate_Ch_property_grid(compute=str, imax=10, **kwargs):
"""Generate a 2-dimensional,
:math:`i_{\\mathrm{max}}\\times i_{\\mathrm{max}}` grid of
nanotube properties.
The property grid is indexed by :math:`(n, m)` chiralities
for :math:`0\\le n\\le i_{\\mathrm{max}}` and
:math:`0\\le m\\le i_{\\mathrm{max}}`.
Parameters
----------
compute_method : str
imax : int
Returns
-------
grid : ndarray
"""
try:
compute_func = \
getattr(importlib.import_module('sknano.structures'), compute)
grid = np.zeros((imax + 1, imax + 1)) - 1
for n in range(imax + 1):
for m in range(imax + 1):
grid[n, m] = compute_func(n, m, **kwargs)
return grid
except AttributeError as e:
print(e)
return None
def get_chiral_type(Ch):
"""Identify the type of nanotube based on its chirality
Parameters
----------
Ch : {str, tuple}
Returns
-------
str
`armchair` for armchair tubes,
`zigzag` for zigzag tubes,
`chiral` for chiral tubes,
"""
if isinstance(Ch, tuple):
n, m = Ch
else:
n, m = get_chiral_indices_from_str(Ch)
if n == m:
return 'armchair'
elif n != m and (n == 0 or m == 0):
return 'zigzag'
else:
return 'chiral'
get_Ch_type = get_chiral_type
[docs]def map_Ch(Ch, compute=None, **kwargs):
"""Map compute function using `Ch` as input.
Parameters
----------
Ch : {str, tuple}
compute : str
Returns
-------
value of compute function.
"""
try:
compute_func = \
getattr(importlib.import_module('sknano.structures'), compute)
if isinstance(Ch, tuple):
n, m = Ch
else:
n, m = get_chiral_indices_from_str(Ch)
return compute_func(n, m, **kwargs)
except AttributeError as e:
print(e)
return None
def get_Ch_map_from_data(Chlist, Chdata):
pass
def get_chiral_indices(*args, check_type=True, **kwargs):
"""Parse the chiral indices `n` and `m` from a `vararg` `*args`, \
which may be a `tuple` or 2 ints or from varkwargs `**kwargs`.
"""
n = m = None
try:
n, m = args
except ValueError:
try:
n, m = args[0]
except IndexError:
try:
n, m = kwargs['Ch']
del kwargs['Ch']
except KeyError:
n = kwargs['n']
del kwargs['n']
m = kwargs['m']
del kwargs['m']
if check_type:
type_check_chiral_indices((n, m))
return n, m, kwargs
get_Ch_indices = get_chiral_indices
def get_chiral_indices_from_str(Ch):
"""Return the chiral indicies `n` and `m`.
Parameters
----------
Ch : str
string of the form 'NNMM' or "(n, m)". Extra spaces are acceptable.
Returns
-------
sequence
2-tuple of chiral indices `n` and `m`
"""
try:
return int(Ch[:2]), int(Ch[2:])
except ValueError:
try:
return tuple([int(c) for c in re.split('[\(\),\s*]+', Ch)[1:-1]])
except Exception as e:
print(e)
return None
def type_check_chiral_indices(*Ch):
"""Check type of chiral indices.
Parameters
----------
Ch : :class:`~python:tuple`
Raises
------
TypeError
"""
n = m = None
try:
n, m = Ch
except ValueError:
try:
n, m = Ch[0]
except IndexError:
raise ValueError('Expected an (n, m) tuple of chiral indices')
if not (isinstance(n, numbers.Real) or n >= 0):
raise TypeError('Expected an integer')
if not (isinstance(m, numbers.Real) or m >= 0):
raise TypeError('Expected an integer')