From 3ee650e95f1f32e5f06db566126ae5600724e524 Mon Sep 17 00:00:00 2001
From: sofiiako <19rubisco93@gmail.com>
Date: Tue, 24 Aug 2021 20:55:45 +0300
Subject: [PATCH] Added Transpose task to section Transposing, Sorting and
Concatenating (should be #1)
---
.../Transpose/__init__.py | 0
.../Transpose/task-info.yaml | 20 ++++++++
.../Transpose/task.md | 49 +++++++++++++++++++
.../Transpose/task.py | 18 +++++++
.../Transpose/tests/__init__.py | 0
.../Transpose/tests/test_task.py | 17 +++++++
.../lesson-info.yaml | 2 +
Numpy/section-info.yaml | 1 +
8 files changed, 107 insertions(+)
create mode 100644 Numpy/Transposing, Sorting, Concatenating/Transpose/__init__.py
create mode 100644 Numpy/Transposing, Sorting, Concatenating/Transpose/task-info.yaml
create mode 100644 Numpy/Transposing, Sorting, Concatenating/Transpose/task.md
create mode 100644 Numpy/Transposing, Sorting, Concatenating/Transpose/task.py
create mode 100644 Numpy/Transposing, Sorting, Concatenating/Transpose/tests/__init__.py
create mode 100644 Numpy/Transposing, Sorting, Concatenating/Transpose/tests/test_task.py
create mode 100644 Numpy/Transposing, Sorting, Concatenating/lesson-info.yaml
diff --git a/Numpy/Transposing, Sorting, Concatenating/Transpose/__init__.py b/Numpy/Transposing, Sorting, Concatenating/Transpose/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Numpy/Transposing, Sorting, Concatenating/Transpose/task-info.yaml b/Numpy/Transposing, Sorting, Concatenating/Transpose/task-info.yaml
new file mode 100644
index 0000000..2b772ca
--- /dev/null
+++ b/Numpy/Transposing, Sorting, Concatenating/Transpose/task-info.yaml
@@ -0,0 +1,20 @@
+type: edu
+files:
+- name: task.py
+ visible: true
+ placeholders:
+ - offset: 147
+ length: 7
+ placeholder_text: '# TODO'
+ - offset: 204
+ length: 17
+ placeholder_text: '# TODO'
+ - offset: 227
+ length: 42
+ placeholder_text: '# TODO'
+- name: tests/test_task.py
+ visible: false
+- name: __init__.py
+ visible: false
+- name: tests/__init__.py
+ visible: false
diff --git a/Numpy/Transposing, Sorting, Concatenating/Transpose/task.md b/Numpy/Transposing, Sorting, Concatenating/Transpose/task.md
new file mode 100644
index 0000000..7e3de5a
--- /dev/null
+++ b/Numpy/Transposing, Sorting, Concatenating/Transpose/task.md
@@ -0,0 +1,49 @@
+## Transpose
+
+When you transpose an array, the row and column indices of every
+element are switched. Item `[0, 1]`, for example, becomes item `[1, 0]`.
+[`numpy.ndarray.transpose`](https://numpy.org/doc/stable/reference/generated/numpy.ndarray.transpose.html#numpy.ndarray.transpose) returns a view of the array with axes transposed.
+Alternatively you can also use the attribute [`a.T`](https://numpy.org/doc/stable/reference/generated/numpy.ndarray.T.html#numpy.ndarray.T).
+
+This method accepts `None` or a tuple of `int`s. In the case of `None` or no argument it reverses the order of the axes.
+In the case of a tuple of `int`s: `i` in the `j`-th place in the tuple means that `a`’s `i`-th axis becomes `a.transpose()`’s `j`-th axis.
+To illustrate:
+
+```python
+a = np.arange(15).reshape(3, 5)
+print(a.transpose())
+print(a.T)
+print(a.transpose(1, 0))
+```
+Output (all print the same thing):
+```text
+[[ 0 5 10]
+ [ 1 6 11]
+ [ 2 7 12]
+ [ 3 8 13]
+ [ 4 9 14]]
+```
+
+> Method [`numpy.ndarray.reshape`](course://Numpy/Array Basics/Reshape) we encountered earlier
+gives a new shape to an array without changing its data and can also be used for transposing.
+
+### Task
+1. Transpose the array `a`.
+2. Transform array `b` so that it looks like this:
+```text
+ [[0 1 2]
+ [3 4 5]
+ [6 7 8]]
+```
+3. Use numpy methods `arange`, `reshape` and `transpose` to acquire a 3-D array `c` that looks like this:
+```text
+[[[ 0 4 8]
+ [ 2 6 10]]
+
+ [[ 1 5 9]
+ [ 3 7 11]]]
+```
+
+You can use either a.T or a.transpose() for the first two arrays.
+
+In #3 use the methods in the suggested order. You can do it in one line of code.
diff --git a/Numpy/Transposing, Sorting, Concatenating/Transpose/task.py b/Numpy/Transposing, Sorting, Concatenating/Transpose/task.py
new file mode 100644
index 0000000..322b723
--- /dev/null
+++ b/Numpy/Transposing, Sorting, Concatenating/Transpose/task.py
@@ -0,0 +1,18 @@
+import numpy as np
+
+a = np.array([['clear', 'usually', 'of'],
+ ['conscience', 'the', 'bad'],
+ ['is', 'sign', 'memory']])
+a = a.T
+
+b = np.array([[0, 3, 6], [1, 4, 7], [2, 5, 8]])
+b = b.transpose()
+
+c = np.arange(12).reshape(3, 2, 2).transpose()
+
+
+if __name__ == '__main__':
+ print(a)
+ print(b)
+ print(c)
+
diff --git a/Numpy/Transposing, Sorting, Concatenating/Transpose/tests/__init__.py b/Numpy/Transposing, Sorting, Concatenating/Transpose/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Numpy/Transposing, Sorting, Concatenating/Transpose/tests/test_task.py b/Numpy/Transposing, Sorting, Concatenating/Transpose/tests/test_task.py
new file mode 100644
index 0000000..a8a4ba7
--- /dev/null
+++ b/Numpy/Transposing, Sorting, Concatenating/Transpose/tests/test_task.py
@@ -0,0 +1,17 @@
+import unittest
+import numpy as np
+
+from task import a, b, c
+
+
+class TestCase(unittest.TestCase):
+ def test_arrays(self):
+ b_test = np.array([[0, 3, 6], [1, 4, 7], [2, 5, 8]]).transpose()
+ c_test = np.arange(12).reshape(3, 2, 2).transpose()
+ a_test = np.array([['clear', 'conscience', 'is'],
+ ['usually', 'the', 'sign'],
+ ['of', 'bad', 'memory']])
+ np.testing.assert_array_equal(a, a_test, err_msg='Array `a` is off!')
+ np.testing.assert_array_equal(b, b_test, err_msg='Array `b` is off!')
+ np.testing.assert_array_equal(c, c_test, err_msg='Array `c` is off!')
+
diff --git a/Numpy/Transposing, Sorting, Concatenating/lesson-info.yaml b/Numpy/Transposing, Sorting, Concatenating/lesson-info.yaml
new file mode 100644
index 0000000..2837ace
--- /dev/null
+++ b/Numpy/Transposing, Sorting, Concatenating/lesson-info.yaml
@@ -0,0 +1,2 @@
+content:
+- Transpose
diff --git a/Numpy/section-info.yaml b/Numpy/section-info.yaml
index 918ecb8..3912573 100644
--- a/Numpy/section-info.yaml
+++ b/Numpy/section-info.yaml
@@ -1,3 +1,4 @@
content:
- Introduction
- Array Basics
+- Transposing, Sorting, Concatenating