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组队学习资料

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hanhuijin
2020-10-12 17:39:29 +08:00
parent f26d3d876f
commit 229b6ee77e
4 changed files with 323 additions and 17 deletions
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108
IntroductionToNumpy/task03 数组的操作-变形/练习-数组操作-变形-答案.ipynb
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@@ -180,6 +180,75 @@
"# [5 6 7 8 9 1 1 1 1 1]]"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**将 `arr`的2维数组按列输出。**\n",
"- `arr = np.array([[16, 17, 18, 19, 20],[11, 12, 13, 14, 15],[21, 22, 23, 24, 25],[31, 32, 33, 34, 35],[26, 27, 28, 29, 30]])`\n",
"\n",
"【知识点：数组的操作】\n",
"- 如何访问二维数组的全部元素，并按列输出？"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[16 11 21 31 26 17 12 22 32 27 18 13 23 33 28 19 14 24 34 29 20 15 25 35\n",
" 30]\n"
]
}
],
"source": [
"import numpy as np\n",
"arr = np.array([[16, 17, 18, 19, 20],[11, 12, 13, 14, 15],[21, 22, 23, 24, 25],[31, 32, 33, 34, 35],[26, 27, 28, 29, 30]])\n",
"y = arr.flatten(order='F')\n",
"print(y)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**给定两个随机数组A和B，验证它们是否相等。**\n",
"\n",
"- `A = np.random.randint(0,2,5) B = np.random.randint(0,2,5)`"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"True\n",
"True\n"
]
}
],
"source": [
"import numpy as np\n",
"A = np.array([1,2,3])\n",
"B = np.array([1,2,3])\n",
"\n",
"# Assuming identical shape of the arrays and a tolerance for the comparison of values\n",
"equal = np.allclose(A,B)\n",
"print(equal)\n",
"\n",
"# Checking both the shape and the element values, no tolerance (values have to be exactly equal)\n",
"equal = np.array_equal(A,B)\n",
"print(equal)"
]
},
{
"cell_type": "markdown",
"metadata": {
@@ -235,6 +304,41 @@
"metadata": {},
"source": []
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"**建立一个随机数在1-10之间的3行2列的数组，并将其转换成2行3列的数组。**\n",
"\n",
"【知识点：数组的操作】\n",
"- 改变数组形状？"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"[[9 0]\n",
" [3 3]\n",
" [4 6]]\n",
"[[9 0 3]\n",
" [3 4 6]]\n"
]
}
],
"source": [
"import numpy as np\n",
"x = np.random.randint(10, size=[3, 2])\n",
"print(x)\n",
"y = np.reshape(x, [2,3])\n",
"print(y)"
]
},
{
"cell_type": "code",
"execution_count": null,
@@ -245,9 +349,9 @@
],
"metadata": {
"kernelspec": {
"display_name": "Python35",
"display_name": "Python 3",
"language": "python",
"name": "python35"
"name": "python3"
},
"language_info": {
"codemirror_mode": {

39
IntroductionToNumpy/task03 数组的操作-变形/练习-数组操作-变形.ipynb
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@@ -27,7 +27,7 @@
"cell_type": "markdown",
"metadata": {},
"source": [
"### **8. 将数组a与数组b水平堆叠。**\n",
"### 将数组a与数组b水平堆叠。\n",
"- `a = np.arange(10).reshape([2, -1])`\n",
"- `b = np.repeat(1, 10).reshape([2, -1])`\n",
"\n",
@@ -35,6 +35,30 @@
"- 如何水平叠加两个数组？"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### **将 `arr`的2维数组按列输出。**\n",
"\n",
"- `arr = np.array([[16, 17, 18, 19, 20],[11, 12, 13, 14, 15],[21, 22, 23, 24, 25],[31, 32, 33, 34, 35],[26, 27, 28, 29, 30]])`\n",
"\n",
"【知识点：数组的操作】\n",
"- 如何访问二维数组的全部元素，并按列输出？"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### **给定两个随机数组A和B，验证它们是否相等。**\n",
"\n",
"- `A = np.random.randint(0,2,5) B = np.random.randint(0,2,5)`\n",
"\n",
"【知识点：数组的操作】\n",
"- np.allclose()"
]
},
{
"cell_type": "markdown",
"metadata": {},
@@ -46,20 +70,13 @@
"【知识点：数组操作】\n",
"- 如何在numpy数组中找到重复值？"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python35",
"display_name": "Python 3",
"language": "python",
"name": "python35"
"name": "python3"
},
"language_info": {
"codemirror_mode": {
@@ -84,7 +101,7 @@
"toc_cell": false,
"toc_position": {},
"toc_section_display": true,
"toc_window_display": false
"toc_window_display": true
},
"varInspector": {
"cols": {

151
IntroductionToNumpy/task04 数学函数及逻辑函数/练习--数学函数，逻辑函数-答案.ipynb
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42
IntroductionToNumpy/task04 数学函数及逻辑函数/练习--数学函数，逻辑函数.ipynb
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@@ -100,6 +100,34 @@
"则P到直线的距离为:d=|Ax0+By0+C|/√(A²+B²)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### **画正弦函数和余弦函数， x = np.arange(0, 3 * np.pi, 0.1)？**\n",
"【知识点：数学函数】"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### **减去矩阵每一行的平均值 ？**\n",
"【知识点：数学函数】\n",
"- 提示: mean(axis=,keepdims=)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### **进行概率统计分析 ？**\n",
"- `arr1 = np.random.randint(1,10,10)\n",
"arr2 = np.random.randint(1,10,10))\n",
"【知识点：数学函数】 \n",
"平均数，中位数，方差，标准差，相关性矩阵，协方差矩阵等`\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
@@ -153,6 +181,16 @@
"- (提示: np.logical_not, np.negative)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### **找出数组中与给定值最接近的数**\n",
"\n",
"【知识点：逻辑函数】\n",
"- (提示: np.abs().argmin())"
]
},
{
"cell_type": "code",
"execution_count": null,
@@ -163,9 +201,9 @@
],
"metadata": {
"kernelspec": {
"display_name": "Python35",
"display_name": "Python 3",
"language": "python",
"name": "python35"
"name": "python3"
},
"language_info": {
"codemirror_mode": {