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Wrap lines that go beyond GitHub Editor (#1925)

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* Wrap lines that go beyond GiHub Editor

* flake8 --count --select=E501 --max-line-length=127

* updating DIRECTORY.md

* Update strassen_matrix_multiplication.py

* fixup! Format Python code with psf/black push

* Update decision_tree.py

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
This commit is contained in:
Christian Clauss
2020-05-01 23:36:35 +02:00
committed by GitHub
parent bcaa88b26c
commit 6acd7fb5ce
19 changed files with 161 additions and 82 deletions
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29
matrix/matrix_class.py
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@ -3,7 +3,8 @@
class Matrix:
"""
Matrix object generated from a 2D array where each element is an array representing a row.
Matrix object generated from a 2D array where each element is an array representing
a row.
Rows can contain type int or float.
Common operations and information available.
>>> rows = [
@ -16,13 +17,13 @@ class Matrix:
[[1. 2. 3.]
[4. 5. 6.]
[7. 8. 9.]]
Matrix rows and columns are available as 2D arrays
>>> print(matrix.rows)
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> print(matrix.columns())
[[1, 4, 7], [2, 5, 8], [3, 6, 9]]
Order is returned as a tuple
>>> matrix.order
(3, 3)
@ -33,7 +34,8 @@ class Matrix:
>>> matrix.is_invertable()
False
Identity, Minors, Cofactors and Adjugate are returned as Matrices. Inverse can be a Matrix or Nonetype
Identity, Minors, Cofactors and Adjugate are returned as Matrices. Inverse can be
a Matrix or Nonetype
>>> print(matrix.identity())
[[1. 0. 0.]
[0. 1. 0.]
@ -46,7 +48,8 @@ class Matrix:
[[-3. 6. -3.]
[6. -12. 6.]
[-3. 6. -3.]]
>>> print(matrix.adjugate()) # won't be apparent due to the nature of the cofactor matrix
>>> # won't be apparent due to the nature of the cofactor matrix
>>> print(matrix.adjugate())
[[-3. 6. -3.]
[6. -12. 6.]
[-3. 6. -3.]]
@ -57,7 +60,8 @@ class Matrix:
>>> matrix.determinant()
0
Negation, scalar multiplication, addition, subtraction, multiplication and exponentiation are available and all return a Matrix
Negation, scalar multiplication, addition, subtraction, multiplication and
exponentiation are available and all return a Matrix
>>> print(-matrix)
[[-1. -2. -3.]
[-4. -5. -6.]
@ -102,8 +106,9 @@ class Matrix:
def __init__(self, rows):
error = TypeError(
"Matrices must be formed from a list of zero or more lists containing at least "
"one and the same number of values, each of which must be of type int or float."
"Matrices must be formed from a list of zero or more lists containing at "
"least one and the same number of values, each of which must be of type "
"int or float."
)
if len(rows) != 0:
cols = len(rows[0])
@ -159,10 +164,8 @@ class Matrix:
)
else:
return sum(
[
self.rows[0][column] * self.cofactors().rows[0][column]
for column in range(self.num_columns)
]
self.rows[0][column] * self.cofactors().rows[0][column]
for column in range(self.num_columns)
)
def is_invertable(self):
@ -346,7 +349,7 @@ class Matrix:
@classmethod
def dot_product(cls, row, column):
return sum([row[i] * column[i] for i in range(len(row))])
return sum(row[i] * column[i] for i in range(len(row)))
if __name__ == "__main__":