从所有排列的数据中创建一个矩阵

Question

我有一个数据，所有可能的组合两个车站在加州火车和票价之间的旅行。我想建立一个价值矩阵，但我不明白是怎么做的。数据看起来如下：

+=========================+=========================+========+
|       SOURCE_STN        |        DEST_STN         | RC1($) |
+=========================+=========================+========+
| 22nd Street             | Atherton                |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Redwood City            |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Millbrae Transit Center |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Stanford                |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Santa Clara             |   10.5 |
+-------------------------+-------------------------+--------+
| 22nd Street             | California Ave.         |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Tamien                  |   10.5 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Lawrence                |   10.5 |
+-------------------------+-------------------------+--------+
| 22nd Street             | San Antonio             |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Burlingame              |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | San Mateo               |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Hayward Park            |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Blossom Hill            |  12.75 |
+-------------------------+-------------------------+--------+
| 22nd Street             | South San Francisco     |   3.75 |
+-------------------------+-------------------------+--------+
| 22nd Street             | San Carlos              |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | San Jose Diridon        |   10.5 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Gilroy                  |     15 |
+-------------------------+-------------------------+--------+
| 22nd Street             | College Park            |   10.5 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Palo Alto               |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Belmont                 |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Broadway                |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Sunnyvale               |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | San Martin              |     15 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Morgan Hill             |     15 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Hillsdale               |      6 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Capitol                 |  12.75 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Bayshore                |   3.75 |
+-------------------------+-------------------------+--------+
| 22nd Street             | Mountain View           |   8.25 |
+-------------------------+-------------------------+--------+
| 22nd Street             | San Francisco           |   3.75 |
+-------------------------+-------------------------+--------+
| Atherton                | Redwood City            |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Millbrae Transit Center |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Stanford                |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | Santa Clara             |   10.5 |
+-------------------------+-------------------------+--------+
| Atherton                | California Ave.         |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | Tamien                  |   10.5 |
+-------------------------+-------------------------+--------+
| Atherton                | Lawrence                |   10.5 |
+-------------------------+-------------------------+--------+
| Atherton                | San Antonio             |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | Burlingame              |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | San Mateo               |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Hayward Park            |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Blossom Hill            |  12.75 |
+-------------------------+-------------------------+--------+
| Atherton                | South San Francisco     |   3.75 |
+-------------------------+-------------------------+--------+
| Atherton                | San Carlos              |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | San Jose Diridon        |   10.5 |
+-------------------------+-------------------------+--------+
| Atherton                | Gilroy                  |     15 |
+-------------------------+-------------------------+--------+
| Atherton                | College Park            |   10.5 |
+-------------------------+-------------------------+--------+
| Atherton                | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | Palo Alto               |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | 22nd Street             |   3.75 |
+-------------------------+-------------------------+--------+
| Atherton                | Broadway                |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Sunnyvale               |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | San Martin              |     15 |
+-------------------------+-------------------------+--------+
| Atherton                | Belmont                 |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Morgan Hill             |     15 |
+-------------------------+-------------------------+--------+
| Atherton                | Hillsdale               |      6 |
+-------------------------+-------------------------+--------+
| Atherton                | Capitol                 |  12.75 |
+-------------------------+-------------------------+--------+
| Atherton                | Bayshore                |   3.75 |
+-------------------------+-------------------------+--------+
| Atherton                | Mountain View           |   8.25 |
+-------------------------+-------------------------+--------+
| Atherton                | San Francisco           |   3.75 |
+-------------------------+-------------------------+--------+
| Bayshore                | Atherton                |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | Redwood City            |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Millbrae Transit Center |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Stanford                |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | Santa Clara             |   10.5 |
+-------------------------+-------------------------+--------+
| Bayshore                | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | 22nd Street             |   3.75 |
+-------------------------+-------------------------+--------+
| Bayshore                | Broadway                |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Sunnyvale               |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | San Martin              |     15 |
+-------------------------+-------------------------+--------+
| Bayshore                | California Ave.         |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | Tamien                  |   10.5 |
+-------------------------+-------------------------+--------+
| Bayshore                | Lawrence                |   10.5 |
+-------------------------+-------------------------+--------+
| Bayshore                | San Antonio             |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | Burlingame              |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | San Mateo               |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Hayward Park            |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Blossom Hill            |  12.75 |
+-------------------------+-------------------------+--------+
| Bayshore                | South San Francisco     |   3.75 |
+-------------------------+-------------------------+--------+
| Bayshore                | San Carlos              |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | San Jose Diridon        |   10.5 |
+-------------------------+-------------------------+--------+
| Bayshore                | Gilroy                  |     15 |
+-------------------------+-------------------------+--------+
| Bayshore                | College Park            |   10.5 |
+-------------------------+-------------------------+--------+
| Bayshore                | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | Palo Alto               |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | Belmont                 |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Morgan Hill             |     15 |
+-------------------------+-------------------------+--------+
| Bayshore                | Hillsdale               |      6 |
+-------------------------+-------------------------+--------+
| Bayshore                | Capitol                 |  12.75 |
+-------------------------+-------------------------+--------+
| Bayshore                | Mountain View           |   8.25 |
+-------------------------+-------------------------+--------+
| Bayshore                | San Francisco           |   3.75 |
+-------------------------+-------------------------+--------+
| Belmont                 | Atherton                |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | Redwood City            |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | Millbrae Transit Center |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | Stanford                |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | Santa Clara             |   10.5 |
+-------------------------+-------------------------+--------+
| Belmont                 | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | 22nd Street             |   3.75 |
+-------------------------+-------------------------+--------+
| Belmont                 | Broadway                |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | Sunnyvale               |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | San Martin              |     15 |
+-------------------------+-------------------------+--------+
| Belmont                 | California Ave.         |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | Tamien                  |   10.5 |
+-------------------------+-------------------------+--------+
| Belmont                 | Lawrence                |   10.5 |
+-------------------------+-------------------------+--------+
| Belmont                 | San Antonio             |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | Burlingame              |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | San Mateo               |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | Hayward Park            |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | Blossom Hill            |  12.75 |
+-------------------------+-------------------------+--------+
| Belmont                 | South San Francisco     |   3.75 |
+-------------------------+-------------------------+--------+
| Belmont                 | San Carlos              |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | San Jose Diridon        |   10.5 |
+-------------------------+-------------------------+--------+
| Belmont                 | Gilroy                  |     15 |
+-------------------------+-------------------------+--------+
| Belmont                 | College Park            |   10.5 |
+-------------------------+-------------------------+--------+
| Belmont                 | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | Palo Alto               |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | Morgan Hill             |     15 |
+-------------------------+-------------------------+--------+
| Belmont                 | Hillsdale               |      6 |
+-------------------------+-------------------------+--------+
| Belmont                 | Capitol                 |  12.75 |
+-------------------------+-------------------------+--------+
| Belmont                 | Bayshore                |   3.75 |
+-------------------------+-------------------------+--------+
| Belmont                 | Mountain View           |   8.25 |
+-------------------------+-------------------------+--------+
| Belmont                 | San Francisco           |   3.75 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Atherton                |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Redwood City            |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Millbrae Transit Center |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Stanford                |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Santa Clara             |   10.5 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | 22nd Street             |   3.75 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Broadway                |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Sunnyvale               |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | San Martin              |     15 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | California Ave.         |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Tamien                  |   10.5 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Lawrence                |   10.5 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | San Antonio             |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Burlingame              |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | San Mateo               |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Hayward Park            |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | South San Francisco     |   3.75 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | San Carlos              |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | San Jose Diridon        |   10.5 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Gilroy                  |     15 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | College Park            |   10.5 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Palo Alto               |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Belmont                 |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Morgan Hill             |     15 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Hillsdale               |      6 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Capitol                 |  12.75 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Bayshore                |   3.75 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | Mountain View           |   8.25 |
+-------------------------+-------------------------+--------+
| Blossom Hill            | San Francisco           |   3.75 |
+-------------------------+-------------------------+--------+
| Broadway                | Atherton                |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | Redwood City            |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | Millbrae Transit Center |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | Stanford                |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | Santa Clara             |   10.5 |
+-------------------------+-------------------------+--------+
| Broadway                | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | 22nd Street             |   3.75 |
+-------------------------+-------------------------+--------+
| Broadway                | Sunnyvale               |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | San Martin              |     15 |
+-------------------------+-------------------------+--------+
| Broadway                | California Ave.         |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | Tamien                  |   10.5 |
+-------------------------+-------------------------+--------+
| Broadway                | Lawrence                |   10.5 |
+-------------------------+-------------------------+--------+
| Broadway                | San Antonio             |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | Burlingame              |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | San Mateo               |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | Hayward Park            |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | Blossom Hill            |  12.75 |
+-------------------------+-------------------------+--------+
| Broadway                | South San Francisco     |   3.75 |
+-------------------------+-------------------------+--------+
| Broadway                | San Carlos              |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | San Jose Diridon        |   10.5 |
+-------------------------+-------------------------+--------+
| Broadway                | Gilroy                  |     15 |
+-------------------------+-------------------------+--------+
| Broadway                | College Park            |   10.5 |
+-------------------------+-------------------------+--------+
| Broadway                | Menlo Park              |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | Palo Alto               |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | Morgan Hill             |     15 |
+-------------------------+-------------------------+--------+
| Broadway                | Belmont                 |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | Hillsdale               |      6 |
+-------------------------+-------------------------+--------+
| Broadway                | Capitol                 |  12.75 |
+-------------------------+-------------------------+--------+
| Broadway                | Bayshore                |   3.75 |
+-------------------------+-------------------------+--------+
| Broadway                | Mountain View           |   8.25 |
+-------------------------+-------------------------+--------+
| Broadway                | San Francisco           |   3.75 |
+-------------------------+-------------------------+--------+

我试着用pd.Dataframe(index =，columns =)做一些事情，但是它不起作用。一定是这样的：

+---------------+----------------+-----------+
|    station    |  San Francisco |  Broadway |
+---------------+----------------+-----------+
| San Francisco |  0             |  value    |
| Broadway      | value          |  0        |
+---------------+----------------+-----------+

谢谢!

Answer 1

您需要使用df.pivot()。

df.pivot(index='SOURCE_STN', columns='DEST_STN', values='RC1($)').fillna(0)

编辑：

对于带有重复项的数据，您需要使用df.pivot_table()，并在aggfunc参数中指定一个聚合函数。

import numpy as np

df.pivot_table(index='SOURCE_STN', columns='DEST_STN', values='RC1($)', aggfunc=np.sum).fillna(0)

Answer 2

你可以通过在熊猫身上使用表格来实现这一点。

data_frame.pivot_table('RC1($)', 'SOURCE_STN', 'DEST_STN').fillna(0)

解释：

您期望的矩阵可以通过以下代码来实现，因为排列仍然保留，同时还通过获取重复值的平均值来管理重复项。

import pandas as pd
import numpy as np

route_table = pd.read_csv("path_to_file.csv")

route_matrix = route_table.pivot_table('RC1($)', 'SOURCE_STN', 'DEST_STN', aggfunc=np.mean).fillna(0)
print(route_matrix)

输出：

DEST_STN                 22nd Street  Atherton  ...  Sunnyvale  Tamien
SOURCE_STN                                      ...                   
22nd Street                     0.00      8.25  ...       8.25    10.5
Atherton                        3.75      0.00  ...       8.25    10.5
Bayshore                        3.75      8.25  ...       8.25    10.5
Belmont                         3.75      8.25  ...       8.25    10.5
Blossom Hill                    3.75      8.25  ...       8.25    10.5
Broadway                        3.75      8.25  ...       8.25    10.5
Burlingame                      3.75      8.25  ...       8.25    10.5
California Ave.                 3.75      8.25  ...       8.25    10.5
Capitol                         3.75      8.25  ...       8.25    10.5
College Park                    3.75      8.25  ...       8.25    10.5
Gilroy                          3.75      8.25  ...       8.25    10.5
Hillsdale                       3.75      8.25  ...       8.25    10.5

用于不同角度的旋转表以获得更好的理解：

交替码

route_matrix = route_table.pivot_table('RC1($)', 'DEST_STN', 'SOURCE_STN', aggfunc=np.mean).fillna(0)
print(route_matrix)

输出

SOURCE_STN               22nd Street  Atherton  ...  Sunnyvale  Tamien
DEST_STN                                        ...                   
22nd Street                     0.00      3.75  ...       3.75    3.75
Atherton                        8.25      0.00  ...       8.25    8.25
Bayshore                        3.75      3.75  ...       3.75    3.75
Belmont                         6.00      6.00  ...       6.00    6.00
Blossom Hill                   12.75     12.75  ...      12.75   12.75
Broadway                        6.00      6.00  ...       6.00    6.00
Burlingame                      6.00      6.00  ...       6.00    6.00
California Ave.                 8.25      8.25  ...       8.25    8.25
Capitol                        12.75     12.75  ...      12.75   12.75
College Park                   10.50     10.50  ...      10.50   10.50
Gilroy                         15.00     15.00  ...      15.00   15.00