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"source": [
"# Python Library Practice: NumPy\n",
"\n",
"NumPy is the fundamental package for scientific computing in Python. It provides high-performance multidimensional array objects and tools for working with them.\n",
"\n",
"### Resources:\n",
"Refer to the **[Mathematics for Data Science](https://aashishgarg13.github.io/DataScience/math-ds-complete/)** section on your hub for Linear Algebra concepts that use NumPy.\n",
"\n",
"### Objectives:\n",
"1. **Array Creation**: Create arrays from lists and using built-in functions.\n",
"2. **Array Operations**: Element-wise math and broadcasting.\n",
"3. **Indexing & Slicing**: Selecting specific data points.\n",
"4. **Linear Algebra**: Matrix multiplication and dot products.\n",
"\n",
"---"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 1. Array Creation\n",
"\n",
"### Task 1: Create Basics\n",
"1. Create a 1D array of numbers from 0 to 9.\n",
"2. Create a 3x3 identity matrix."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"import numpy as np\n",
"\n",
"# YOUR CODE HERE\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<details>\n",
"<summary><b>Click to see Solution</b></summary>\n",
"\n",
"```python\n",
"arr1 = np.arange(10)\n",
"identity = np.eye(3)\n",
"print(arr1)\n",
"print(identity)\n",
"```\n",
"</details>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 2. Array Operations\n",
"\n",
"### Task 2: Vector Math\n",
"Given two arrays `a = [10, 20, 30]` and `b = [1, 2, 3]`, perform addition, subtraction, and element-wise multiplication."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"a = np.array([10, 20, 30])\n",
"b = np.array([1, 2, 3])\n",
"\n",
"# YOUR CODE HERE\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<details>\n",
"<summary><b>Click to see Solution</b></summary>\n",
"\n",
"```python\n",
"print(\"Add:\", a + b)\n",
"print(\"Sub:\", a - b)\n",
"print(\"Mul:\", a * b)\n",
"```\n",
"</details>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 3. Indexing and Slicing\n",
"\n",
"### Task 3: Select Subsets\n",
"Create a 4x4 matrix and extract the middle 2x2 square."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"mat = np.arange(16).reshape(4, 4)\n",
"print(\"Original:\\n\", mat)\n",
"\n",
"# YOUR CODE HERE\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<details>\n",
"<summary><b>Click to see Solution</b></summary>\n",
"\n",
"```python\n",
"middle = mat[1:3, 1:3]\n",
"print(\"Middle 2x2:\\n\", middle)\n",
"```\n",
"</details>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 4. Statistics with NumPy\n",
"\n",
"### Task 4: Aggregations\n",
"Calculate the mean, standard deviation, and sum of a random 100-element array."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"data = np.random.randn(100)\n",
"\n",
"# YOUR CODE HERE\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"<details>\n",
"<summary><b>Click to see Solution</b></summary>\n",
"\n",
"```python\n",
"print(\"Mean:\", np.mean(data))\n",
"print(\"Std:\", np.std(data))\n",
"print(\"Sum:\", np.sum(data))\n",
"```\n",
"</details>"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"--- \n",
"### Great NumPy Practice! \n",
"NumPy is the engine behind Pandas and Scikit-Learn. Mastering it makes everything else easier.\n",
"Next: **Pandas Practice**."
]
}
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