forked from s_ranjbar/city_retrofit
83 lines
2.3 KiB
Python
83 lines
2.3 KiB
Python
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# -*- coding: utf-8 -*-
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import numpy as np
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'''
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General purpose functions for clean up the code in critical areas.
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'''
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def sort_numpy(array, col=0, order_back=False):
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"""
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Sorts the columns for an entire ``ndarrray`` according to sorting
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one of them.
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:param array: Array to sort.
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:type array: ndarray
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:param col: Master column to sort.
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:type col: int
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:param order_back: If True, also returns the index to undo the
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new order.
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:type order_back: bool
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:returns: sorted_array or [sorted_array, order_back]
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:rtype: ndarray, list
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"""
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x = array[:,col]
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sorted_index = np.argsort(x, kind = 'quicksort')
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sorted_array = array[sorted_index]
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if not order_back:
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return sorted_array
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else:
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n_points = sorted_index.shape[0]
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order_back = np.empty(n_points, dtype=int)
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order_back[sorted_index] = np.arange(n_points)
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return [sorted_array, order_back]
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def arange_col(n, dtype=int):
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"""
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Returns ``np.arange`` in a column form.
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:param n: Length of the array.
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:type n: int
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:param dtype: Type of the array.
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:type dtype: type
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:returns: ``np.arange`` in a column form.
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:rtype: ndarray
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"""
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return np.reshape(np.arange(n, dtype = dtype), (n, 1))
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def bool2index(bool_):
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"""
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Returns a numpy array with the indices where bool\_ is True.
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:param bool_: bool array to extract Trues positions.
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:type bool_: ndarray (type=bool)
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:returns: Array with the indices where bool\_ is True.
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:rtype: ndarray
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.. seealso:: :func:`index2bool`
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"""
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return np.arange(bool_.shape[0])[bool_]
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def index2bool(index, length=None):
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"""
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Returns a numpy boolean array with Trues in the input index
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positions.
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:param index: index array with the Trues positions.
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:type index: ndarray (type=int)
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:param length: Length of the returned array.
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:type length: int or None
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:returns: array with Trues in the input index positions.
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:rtype: ndarray
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.. seealso:: :func:`bool2index`
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"""
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if index.shape[0] == 0 and length is None:
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return np.arange(0, dtype = bool)
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if length is None: length = index.max()+1
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sol = np.zeros(length, dtype=bool)
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sol[index] = True
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return sol
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