From 4e3bb6275162bb63bc8a009621398316692a89eb Mon Sep 17 00:00:00 2001
From: sofiiako <19rubisco93@gmail.com>
Date: Wed, 22 Sep 2021 16:53:54 +0300
Subject: [PATCH] Added task element-wise comparison
---
.../Element-wise Comparison/__init__.py | 0
.../Element-wise Comparison/task-info.yaml | 17 ++++++
.../Element-wise Comparison/task.md | 57 +++++++++++++++++++
.../Element-wise Comparison/task.py | 15 +++++
.../Element-wise Comparison/tests/__init__.py | 0
.../tests/test_task.py | 15 +++++
Numpy/Compare, Search/lesson-info.yaml | 1 +
7 files changed, 105 insertions(+)
create mode 100644 Numpy/Compare, Search/Element-wise Comparison/__init__.py
create mode 100644 Numpy/Compare, Search/Element-wise Comparison/task-info.yaml
create mode 100644 Numpy/Compare, Search/Element-wise Comparison/task.md
create mode 100644 Numpy/Compare, Search/Element-wise Comparison/task.py
create mode 100644 Numpy/Compare, Search/Element-wise Comparison/tests/__init__.py
create mode 100644 Numpy/Compare, Search/Element-wise Comparison/tests/test_task.py
diff --git a/Numpy/Compare, Search/Element-wise Comparison/__init__.py b/Numpy/Compare, Search/Element-wise Comparison/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Numpy/Compare, Search/Element-wise Comparison/task-info.yaml b/Numpy/Compare, Search/Element-wise Comparison/task-info.yaml
new file mode 100644
index 0000000..73e0181
--- /dev/null
+++ b/Numpy/Compare, Search/Element-wise Comparison/task-info.yaml
@@ -0,0 +1,17 @@
+type: edu
+files:
+- name: task.py
+ visible: true
+ placeholders:
+ - offset: 56
+ length: 19
+ placeholder_text: '# TODO'
+ - offset: 90
+ length: 14
+ 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/Compare, Search/Element-wise Comparison/task.md b/Numpy/Compare, Search/Element-wise Comparison/task.md
new file mode 100644
index 0000000..b65fcf1
--- /dev/null
+++ b/Numpy/Compare, Search/Element-wise Comparison/task.md
@@ -0,0 +1,57 @@
+## Element-wise comparison
+
+Element-wise comparison is when you compare each element of one array to an element of another array.
+[`numpy.equal`](https://numpy.org/doc/stable/reference/generated/numpy.equal.html) is the function that returns `(x1 == x2)` element-wise.
+It accepts two input arrays, which must either have equal `shape` or be broadcastable to a common shape
+(which becomes the shape of the output). Elements of the output array are typically boolean values.
+
+Example:
+```python
+print(np.equal([0, 1, 3], np.arange(3)))
+```
+Output:
+```text
+[ True, True, False]
+```
+What is compared are values, not types. So an int (1) and an array of length one can evaluate as `True`:
+```python
+print(np.equal(1, np.ones(1)))
+```
+Output:
+```text
+[ True]
+```
+The `==` operator can be used as a shorthand for `np.equal` on ndarrays.
+
+### `numpy.array_equal`
+
+[`numpy.array_equal`](https://numpy.org/doc/stable/reference/generated/numpy.array_equal.html) is the
+function that returns `True` if two input arrays have **the same shape and elements**, and `False` otherwise.
+
+Examples:
+```python
+print(np.array_equal([1, 2], [1, 2]))
+print(np.array_equal(np.array([1, 2]), np.array([1, 2])))
+print(np.array_equal([1, 2], [1, 2, 3]))
+print(np.array_equal([1, 2], [1, 4]))
+```
+Output:
+```text
+True
+True
+False
+False
+```
+
+### Task
+Define a **1-D** array `b`, such that by comparing it element-wise with the array `a` you can
+get the array `compare_a_b`, which is `array_equal` (has the same elements and shape) to the array in the last
+`print` statement. When you run the script, the last `print` statement has to print `True`.
+
+Array b should have be of shape (5,). Use
+np.arange with start, stop and step arguments.
+By looking an the resulting boolean array you can figure out which integer has to be in
+what position in b and then come up with suitable arguments for the np.arange
+function.
+
+To get the array compare_a_b, use the np.equal function.
diff --git a/Numpy/Compare, Search/Element-wise Comparison/task.py b/Numpy/Compare, Search/Element-wise Comparison/task.py
new file mode 100644
index 0000000..3880370
--- /dev/null
+++ b/Numpy/Compare, Search/Element-wise Comparison/task.py
@@ -0,0 +1,15 @@
+import numpy as np
+
+a = np.arange(20).reshape(4, 5)
+b = np.arange(0, 25, 6)
+compare_a_b = np.equal(a, b)
+
+
+if __name__ == '__main__':
+ print(a)
+ print(b)
+ print(np.array_equal(compare_a_b, np.array([[True, False, False, False, False],
+ [False, True, False, False, False],
+ [False, False, True, False, False],
+ [False, False, False, True, False]])))
+
diff --git a/Numpy/Compare, Search/Element-wise Comparison/tests/__init__.py b/Numpy/Compare, Search/Element-wise Comparison/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Numpy/Compare, Search/Element-wise Comparison/tests/test_task.py b/Numpy/Compare, Search/Element-wise Comparison/tests/test_task.py
new file mode 100644
index 0000000..7f219c5
--- /dev/null
+++ b/Numpy/Compare, Search/Element-wise Comparison/tests/test_task.py
@@ -0,0 +1,15 @@
+import unittest
+import numpy as np
+
+from task import *
+
+
+class TestCase(unittest.TestCase):
+ def test_array_b(self):
+ test_b = np.arange(0, 25, 6)
+ self.assertEqual(b.shape, test_b.shape, msg='Shape of array b has to be (5,).')
+
+ def test_array_c(self):
+ test_b = np.arange(0, 25, 6)
+ test_c = np.equal(a, test_b)
+ np.testing.assert_array_equal(compare_a_b, test_c, err_msg='Boolean arrays do not match.')
diff --git a/Numpy/Compare, Search/lesson-info.yaml b/Numpy/Compare, Search/lesson-info.yaml
index 2a9f3d5..8ca6307 100644
--- a/Numpy/Compare, Search/lesson-info.yaml
+++ b/Numpy/Compare, Search/lesson-info.yaml
@@ -1,2 +1,3 @@
content:
- Compare with a scalar
+- Element-wise Comparison