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justhomework/AIandML/e1_python_basics/e1.1_numpy.ipynb

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{
"cells": [
{
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"source": [
"# 人工智能与机器学习-实验1\n",
"\n",
"## Part.II Numpy练习\n",
"\n",
"|学号 |姓名 |\n",
"|----------|--------|\n",
"| | |"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 1. 数组\n",
"\n",
"创建一个长度为10全为0的一维数组然后让第5个元素等于1。"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 2. 向量内积\n",
"\n",
"随机生成2个长度为$10^6$的向量分别用numpy函数和for循环计算其内积。并比较耗时情况。"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 3. 矩阵乘法\n",
"\n",
"生成一个$4\\times5$和一个$5\\times4$的矩阵,并计算它们的乘积。"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 4. 函数\n",
"\n",
"函数$f$定义如下,其中$x$是任意实数:\n",
"$$\n",
"f(x)=\\frac{\\sin(x+1)(x+1)}{2e^x}\n",
"$$\n",
"\n",
"生成一个数组$a\\in \\mathbb{R}^5$,计算$b = f(a)$。"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### 5. 平均值\n",
"\n",
"随机生成一个5行10列的矩阵然后每行元素减去该行的平均值"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
}
],
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"display_name": "Python 3",
"language": "python",
"name": "python3"
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"name": "ipython",
"version": 3
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"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.7.9"
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"nbformat_minor": 2
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