{"id":4941,"date":"2021-10-23T23:27:29","date_gmt":"2021-10-23T14:27:29","guid":{"rendered":"https:\/\/itips.krsw.biz\/?p=4941"},"modified":"2021-10-23T23:27:29","modified_gmt":"2021-10-23T14:27:29","slug":"how-to-convert-pandas-dataframe-numpy-ndarray","status":"publish","type":"post","link":"https:\/\/itips.krsw.biz\/en\/how-to-convert-pandas-dataframe-numpy-ndarray\/","title":{"rendered":"How to convert between Pandas DataFrame and NumPy ndarray"},"content":{"rendered":"

\"How<\/p>\n

<\/div><\/div>
How can I convert Pandas DataFrame to NumPy array ?<\/div><\/div><\/div>\n

When we use array data, we often use NumPy<\/a>.<\/p>\n

And pandas<\/a> is also useful to handle table data.<\/p>\n

We use both of them.<\/p>\n

So sometimes we want to covert both format to each.<\/p>\n

Today I introduce about "How to convert between Pandas DataFrame and NumPy ndarray<\/span>"<\/strong>.<\/p>\n

<\/i>Author<\/p>


\n
<\/div><\/div>
Mid-carieer engineer (AI, system). Good at Python and SQL.<\/div><\/div><\/div>
\n<\/div><\/div>\n

<\/span>Advantage to read<\/span><\/p><\/div>\n

<\/i><\/div>

You can understand \"How to convert between Pandas DataFrame and NumPy ndarray\". Then you can handle array data easily.<\/p><\/div><\/div>\n

<\/p>\n

<\/br><\/p>\n

How to convert Pandas DataFrame to NumPy ndarray<\/h2>\n

\"\"<\/p>\n

In order to convert Pandas DataFrame to NumPy ndarray, you can use values<\/code>.<\/p>\n

With Pandas DataFrame, try df.values<\/code>.<\/p>\n

Then you can get ndarray format data.<\/p>\n

\nimport numpy as np\nimport pandas as pd\n\n# dataframe to numpy ndarray\n\ndata_list1 = [\n[1,2,3],\n[2,3,4],\n[3,4,5],\n[4,5,6]\n]\n\ncol_list1 = ["c1","c2","c3"]\ndf1 = pd.DataFrame(data=data_list1, columns=col_list1)\nprint(df1)\nprint(type(df1))\n\n#    c1  c2  c3\n# 0   1   2   3\n# 1   2   3   4\n# 2   3   4   5\n# 3   4   5   6\n# <class 'pandas.core.frame.DataFrame'>\n\nnp_list = df1.values\nprint(np_list)\nprint(type(np_list))\n\n# [[1 2 3]\n#  [2 3 4]\n#  [3 4 5]\n#  [4 5 6]]\n# <class 'numpy.ndarray'>\n<\/pre>\n
<\/br><\/p>\n
<\/i>reference<\/p>
\n
  • pandas.DataFrame.values \u2014 pandas 1.2.4 documentation<\/a><\/li>\n<\/div><\/div>\n
    <\/br><\/p>\n
    But according to Pandas document,  values<\/code> is not recommended<\/span>.<\/p>\n
    They recommend to use to_numpy()<\/code> instead.<\/p>\n
    \nnp_list = df1.to_numpy()\nprint(np_list)\nprint(type(np_list))\n\n# [[1 2 3]\n#  [2 3 4]\n#  [3 4 5]\n#  [4 5 6]]\n# <class 'numpy.ndarray'>\n<\/pre>\n
    <\/br><\/p>\n
    <\/i>reference<\/p>
    \n
  • pandas.DataFrame.to_numpy \u2014 pandas 1.2.4 documentation<\/a><\/li>\n<\/div><\/div>\n
    <\/br><\/br><\/p>\n
    How to convert NumPy ndarray to Pandas DataFrame<\/h2>\n
    \"\"<\/p>\n
    Next how can we convert NumPy ndarray to Pandas DataFrame ?<\/p>\n
    In order to change ndarray to DataFrame, set ndarray as source data of DataFrame.<\/p>\n
    \n# numpy ndarray to dataframe\n\nnp_list = np.array(data_list1)\nprint(np_list)\nprint(type(np_list))\n\n# [[1 2 3]\n#  [2 3 4]\n#  [3 4 5]\n#  [4 5 6]]\n# <class 'numpy.ndarray'>\n\ncol_list2 = ["c11","c22","c33"]\ndf2 = pd.DataFrame(data=np_list, columns=col_list2)\nprint(df2)\nprint(type(df2))\n\n#    c11  c22  c33\n# 0    1    2    3\n# 1    2    3    4\n# 2    3    4    5\n# 3    4    5    6\n# <class 'pandas.core.frame.DataFrame'>\n<\/pre>\n
    <\/br><\/p>\n
    It is same as converting list data to DataFrame<\/span>.<\/p>\n
    <\/br><\/p>\n
    <\/i>reference<\/p>
    \n
  • pandas.DataFrame \u2014 pandas 1.2.4 documentation<\/a><\/li>\n<\/div><\/div>\n
    <\/br><\/p>\n
    If you want to add ndarray as new column, use df["column name"]<\/code>.<\/p>\n
    \nnp_list2 = np.array([4,4,4,4])\ndf2["c44"] = np_list2\nprint(df2)\nprint(type(df2))\n\n#    c11  c22  c33  c44\n# 0    1    2    3    4\n# 1    2    3    4    4\n# 2    3    4    5    4\n# 3    4    5    6    4\n# <class 'pandas.core.frame.DataFrame'>\n<\/pre>\n
    <\/br><\/br><\/p>\n
    Conclusion<\/h2>\n
    \"\"<\/p>\n
    Today I explained about "How to convert between Pandas DataFrame and NumPy ndarray<\/span>"<\/strong>.<\/p>\n
    We can use below methods to convert.<\/p>\n
    <\/i>How to convert<\/p>
    \n
  • pandas -> numpy: df.values<\/code> or df.to_numpy()<\/code><\/li>\n
  • numpy -> pandas: DataFrame(data=nplist)<\/code><\/li>\n
  • add column to Pandas DataFrame: df[\"column name\"]=nplist<\/code><\/li>\n<\/div><\/div>\n
    <\/br><\/p>\n
    Sometimes we use these. So write down them<\/span>.<\/div><\/div>
    <\/div><\/div><\/div>\n
    <\/br><\/p>\n
    <\/i>Read more<\/p>

    \n\t\t\t\n\t\t\t
    \n\t\t\t\t\t\t\t\t
    \n\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t<\/dt>\n\t\t\t\t\t
    \n\t\t\t\t\t\t\t\t\t\t\t\t\t
    How to convert NumPy ndarray to Python list<\/h5>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/dd>\n\t\t\t\t<\/dl>\n\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t
    \n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
    How can I convert Pandas DataFrame to NumPy array ? When we use array data, we often use NumPy. And  … <\/p>\n","protected":false},"author":1,"featured_media":2919,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"https:\/\/itips.krsw.biz\/?p=4285","footnotes":""},"categories":[6],"tags":[78,35],"class_list":["post-4941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-numpy","tag-pandas","en-US"],"yoast_head":"\nHow to convert between Pandas DataFrame and NumPy ndarray - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba<\/title>\n<meta name=\"description\" content=\"When we use array data, we often use NumPy.And pandas is also useful to handle table data.We use both of them.So sometimes we want to covert both format to each.Today I introduce about "How to convert between Pandas DataFrame and NumPy ndarray".\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itips.krsw.biz\/en\/how-to-convert-pandas-dataframe-numpy-ndarray\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to convert between Pandas DataFrame and NumPy ndarray - 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