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added support for inverse of 3x3 matrix #7355

Merged
merged 6 commits into from Oct 26, 2022
Merged

added support for inverse of 3x3 matrix #7355

merged 6 commits into from Oct 26, 2022

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kituuu
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@kituuu kituuu commented Oct 17, 2022

Describe your change:

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Documentation change?

Checklist:

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • [] All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing.
  • All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
  • If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

@algorithms-keeper algorithms-keeper bot added enhancement This PR modified some existing files awaiting reviews This PR is ready to be reviewed labels Oct 17, 2022
Comment on lines 35 to 63
...
ValueError: This matrix has no inverse.

More examples:

>>> inverse_of_matrix([])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.

>>> inverse_of_matrix([[],[]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.

>>> inverse_of_matrix([[1, 2], [3, 4], [5, 6]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.

>>> inverse_of_matrix([[1, 2, 1], [0,3, 4]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.

>>> inverse_of_matrix([[1, 2, 3], [7, 8, 9], [7, 8, 9]])
Traceback (most recent call last):
...
ValueError: This matrix has no inverse.
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@cclauss cclauss Oct 20, 2022

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We should test that all lines between Traceback and the Error are indented by at least four spaces.

Suggested change
...
ValueError: This matrix has no inverse.
More examples:
>>> inverse_of_matrix([])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[],[]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[1, 2], [3, 4], [5, 6]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[1, 2, 1], [0,3, 4]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[1, 2, 3], [7, 8, 9], [7, 8, 9]])
Traceback (most recent call last):
...
ValueError: This matrix has no inverse.
...
ValueError: This matrix has no inverse.
>>> inverse_of_matrix([])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[],[]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[1, 2], [3, 4], [5, 6]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[1, 2, 1], [0,3, 4]])
Traceback (most recent call last):
...
ValueError: Please provide a matrix of size 2x2 or 3x3.
>>> inverse_of_matrix([[1, 2, 3], [7, 8, 9], [7, 8, 9]])
Traceback (most recent call last):
...
ValueError: This matrix has no inverse.

Comment on lines 144 to 151
adjoint_matrix = [
[d(0.0), d(0.0), d(0.0)],
[d(0.0), d(0.0), d(0.0)],
[d(0.0), d(0.0), d(0.0)],
]
for i in range(3):
for j in range(3):
adjoint_matrix[i][j] = cofactor_matrix[j][i]
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Suggested change
adjoint_matrix = [
[d(0.0), d(0.0), d(0.0)],
[d(0.0), d(0.0), d(0.0)],
[d(0.0), d(0.0), d(0.0)],
]
for i in range(3):
for j in range(3):
adjoint_matrix[i][j] = cofactor_matrix[j][i]
adjoint_matrix = zip(*cofactor_matrix)

https://www.geeksforgeeks.org/transpose-matrix-single-line-python

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Ok sir.

and len(matrix[2]) == 3
):
# Calculate the determinant of the matrix using Sarrus rule
determinant = (
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Suggested change
determinant = (
determinant = float(

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I am on it sir.

@algorithms-keeper algorithms-keeper bot added the tests are failing Do not merge until tests pass label Oct 22, 2022
@kituuu
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kituuu commented Oct 22, 2022

@cclauss Sir, the zip() method involves a list of tuples. And in my code, every matrix was a list of lists. So I used NumPy.array instead of zip. Also, I don't know what error doctest is giving, can u help me with that?
Edit : Now fixed (But I don't know how xD)

@kituuu
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kituuu commented Oct 26, 2022

@poyea @cclauss @dhruvmanila Sir, please review this also. And suggest changes if required. 🥲

matrix/inverse_of_matrix.py Outdated Show resolved Hide resolved
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Co-authored-by: Caeden Perelli-Harris <caedenperelliharris@gmail.com>
Co-authored-by: Chris O <46587501+ChrisO345@users.noreply.github.com>
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I applied all code review suggestions.

Thanks for your persistence!!

@algorithms-keeper algorithms-keeper bot removed the awaiting reviews This PR is ready to be reviewed label Oct 26, 2022
@cclauss cclauss merged commit 9390565 into TheAlgorithms:master Oct 26, 2022
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4 participants