{"id":331,"date":"2022-10-24T18:02:26","date_gmt":"2022-08-20T16:55:05","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/python%e3%81%aelog%e9%96%a2%e6%95%b0%e3%81%af%e5%af%be%e6%95%b0%e3%82%92%e8%a8%88%e7%ae%97%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ab%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%81%be%e3%81%99%e3%80%82\/"},"modified":"2025-07-31T22:43:33","modified_gmt":"2025-07-31T13:43:33","slug":"python%e3%81%aelog%e9%96%a2%e6%95%b0%e3%81%af%e5%af%be%e6%95%b0%e3%82%92%e8%a8%88%e7%ae%97%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ab%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%81%be%e3%81%99%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/python%e3%81%aelog%e9%96%a2%e6%95%b0%e3%81%af%e5%af%be%e6%95%b0%e3%82%92%e8%a8%88%e7%ae%97%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%ab%e4%bd%bf%e7%94%a8%e3%81%95%e3%82%8c%e3%81%be%e3%81%99%e3%80%82\/","title":{"rendered":"Python\u306elog()\u95a2\u6570\u306f\u5bfe\u6570\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002"},"content":{"rendered":"

\u5bfe\u6570\u306f\u5927\u304d\u306a\u6570\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u5bfe\u6570\u306f\u6307\u6570\u306e\u9006\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Python\u306elog()\u95a2\u6570\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002Python\u306e\u5bfe\u6570\u95a2\u6570\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u6570\u5b57\u306e\u5bfe\u6570\u3092\u3088\u308a\u7c21\u5358\u304b\u3064\u52b9\u7387\u7684\u306b\u898b\u3064\u3051\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n

\n

Python\u306elog()\u95a2\u6570\u3092\u7406\u89e3\u3059\u308b\u3002<\/h2>\n

\u4ee5\u4e0b\u306e\u6587\u3092\u4f7f\u3063\u3066\u3001Log\u95a2\u6570\u306e\u6a5f\u80fd\u3092\u5229\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001math\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

import<\/span> math\r\n<\/code><\/pre>\n
Python\u306e\u30ed\u30b0\u95a2\u6570\u306b\u306f\u76f4\u63a5\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u30b3\u30fc\u30c9\u5185\u3067\u30ed\u30b0\u95a2\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306b\u306f\u3001math\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\u69cb\u6587:<\/p>\n
math.<\/span>log(<\/span>x)<\/span>\r\n<\/code><\/pre>\n
math.log(x) \u95a2\u6570\u306f\u3001\u6e21\u3055\u308c\u305f\u30d1\u30e9\u30e1\u30fc\u30bf\u5024\uff08\u6570\u5024\u306e\u8868\u73fe\uff09\u306e\u81ea\u7136\u5bfe\u6570\u5024\u3001\u3059\u306a\u308f\u3061\u5e95e\uff08\u30aa\u30a4\u30e9\u30fc\u6570\u3067\u3042\u308b\u7d04\uff12.\uff17\uff11\uff18\uff12\uff18\uff09\u306e\u5bfe\u6570\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
Please prepare a report on the progress of the project.<\/p>\n
import<\/span> math   \r\n\r\nprint<\/span>(<\/span>\"Log value: \"<\/span>,<\/span> math.<\/span>log(<\/span>2<\/span>)<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306e\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001\u79c1\u305f\u3061\u306f2\u306e\u5bfe\u6570\u5024\u3092\u30ea\u30af\u30a8\u30b9\u30c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u51fa\u529b:<\/p>\n
Log value:<\/span>  0.6931471805599453<\/span>\r\n<\/code><\/pre>\n
\n
Python\u306elog()\u95a2\u6570\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3<\/h2>\n
\u4ee5\u4e0b\u306f\u3001Python\u306b\u304a\u3051\u308b\u57fa\u672c\u306e\u5bfe\u6570\u95a2\u6570\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n
    \n
  • log2(x)<\/li>\n
  • log(x, Base)<\/li>\n
  • log10(x)<\/li>\n
  • log1p(x)<\/li>\n<\/ul>\n
    \n
    1. log2(x) – \u5bfe\u6570\u306e\u5e952<\/h3>\n
    math.log2(x)\u95a2\u6570\u306f\u30012\u3092\u5e95\u3068\u3059\u308b\u6570\u5024\u306e\u5bfe\u6570\u5024\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
    \u6587\u6cd5:<\/p>\n
    math.log2(numeric expression)\r\n<\/code><\/pre>\n
    \u79c1\u306f\u65e5\u672c\u306e\u4f1d\u7d71\u5de5\u82b8\u54c1\u304c\u5927\u597d\u304d\u3067\u3059\u3002<\/p>\n
    Answer:
    \n\u79c1\u306f\u65e5\u672c\u306e\u4f1d\u7d71\u5de5\u82b8\u54c1\u304c\u597d\u304d\u3067\u3059\u3002<\/p>\n
    import<\/span> math \r\n\r\nprint<\/span> (<\/span>\"Log value for base 2: \"<\/span>)<\/span> \r\nprint<\/span> (<\/span>math.<\/span>log2(<\/span>20<\/span>)<\/span>)<\/span> \r\n\r\n<\/code><\/pre>\n
    \u51fa\u529b\uff1a<\/p>\n
    Log value for<\/span> base 2<\/span>:<\/span> \r\n4.321928094887363<\/span>\r\n<\/code><\/pre>\n
    \n
    2. log(n, Base) – log base n \u2192 2. log\u306e\u5e95\u304cBase\u306en\u306e\u5bfe\u6570 – n\u306e\u5bfe\u6570<\/h3>\n
    math.log(x, Base)\u95a2\u6570\u306f\u3001x\u306e\u5bfe\u6570\u5024\u3001\u3064\u307e\u308a\u7279\u5b9a\u306e\uff08\u671b\u307e\u3057\u3044\uff09\u57fa\u5e95\u5024\u306b\u5bfe\u3059\u308b\u6570\u5024\u8868\u73fe\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n
    \u6587\u7ae0\u69cb\u6587<\/p>\n
    math.<\/span>log(<\/span>numeric_expression,<\/span>base_value)<\/span>\r\n<\/code><\/pre>\n
    \u3053\u306e\u6a5f\u80fd\u306f2\u3064\u306e\u5f15\u6570\u3092\u53d7\u3051\u5165\u308c\u307e\u3059\u3002<\/p>\n
      \n
    • numeric expression<\/li>\n
    • Base value<\/li>\n<\/ul>\n
      \u6ce8\u610f\uff1a\u95a2\u6570\u306b\u57fa\u672c\u5024\u304c\u63d0\u4f9b\u3055\u308c\u306a\u3044\u5834\u5408\u3001math.log(x,\uff08Base\uff09)\u306f\u57fa\u672c\u30ed\u30b0\u95a2\u6570\u3068\u3057\u3066\u6a5f\u80fd\u3057\u3001\u6570\u5024\u5f0f\u306elog\u3092\u57fa\u5e95e\u3067\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n
      \u6b21\u306e\u6587\u7ae0\u3092\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u4e00\u3064\u306e\u7b54\u3048\u3067\u69cb\u3044\u307e\u305b\u3093\u3002<\/p>\n
      Original sentence: “I will go to the park tomorrow.”<\/p>\n
      Paraphrased sentence in Japanese:\u300c\u660e\u65e5\u3001\u79c1\u306f\u516c\u5712\u306b\u884c\u304d\u307e\u3059\u3002\u300d<\/p>\n
      import<\/span> math \r\n\r\nprint<\/span> (<\/span>\"Log value for base 4 : \"<\/span>)<\/span> \r\nprint<\/span> (<\/span>math.<\/span>log(<\/span>20<\/span>,<\/span>4<\/span>)<\/span>)<\/span> \r\n\r\n<\/code><\/pre>\n
      \u51fa\u529b\uff1a<\/p>\n
      Log value for<\/span> base 4<\/span> :<\/span> \r\n2.1609640474436813<\/span>\r\n<\/code><\/pre>\n
      \n
      3. log10(x) – log\u306e\u5e95\u304c10\u306e\u5834\u5408<\/h3>\n
      math.log10(x)\u95a2\u6570\u306f\u3001\u6570\u5024\u5f0f\u306e\u5bfe\u6570\u5024\u309210\u3092\u5e95\u3068\u3057\u3066\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n
      \u6587\u6cd5\uff08\u3076\u3093\u307d\u3046\uff09\uff1a<\/p>\n
      math.<\/span>log10(<\/span>numeric_expression)<\/span>\r\n<\/code><\/pre>\n
      \u3053\u308c\u306f\u65e5\u672c\u8a9e\u3067\u66f8\u304b\u308c\u305f\u30e1\u30fc\u30eb\u3067\u3059\u3002<\/p>\n
      import<\/span> math \r\n\r\nprint<\/span> (<\/span>\"Log value for base 10: \"<\/span>)<\/span> \r\nprint<\/span> (<\/span>math.<\/span>log10(<\/span>15<\/span>)<\/span>)<\/span> \r\n\r\n<\/code><\/pre>\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001\u5e95\u304c10\u306e\u5834\u5408\u306e15\u306e\u5bfe\u6570\u5024\u304c\u8a08\u7b97\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
      \u7d50\u679c: \u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u30011\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u69cb\u3044\u307e\u305b\u3093:<\/p>\n
      Log value for<\/span> base 10<\/span> :<\/span> \r\n1.1760912590556813<\/span>\r\n<\/code><\/pre>\n
      \n
      4. log1p(x) \u306e\u81ea\u7136\u5bfe\u6570\u3092\u6c42\u3081\u308b\u3002<\/h3>\n
      math.log1p(x)\u95a2\u6570\u306f\u3001\u7279\u5b9a\u306e\u5165\u529b\u5024x\u306elog(1+x)\u3092\u8a08\u7b97\u3057\u307e\u3059\u3002<\/p>\n
      \u6ce8\u610f\uff1amath.log1p(1+x)\u306fmath.log(x)\u3068\u540c\u7b49\u3067\u3059\u3002<\/p>\n
      \u6587\u6cd5:<\/p>\n
      math.log1p(numeric_expression)\r\n<\/code><\/pre>\n
      \u4f8b\u3048\u3070: “I like to play tennis.”<\/p>\n
      import<\/span> math \r\n\r\nprint<\/span> (<\/span>\"Log value(1+15) for x = 15 is: \"<\/span>)<\/span> \r\nprint<\/span> (<\/span>math.<\/span>log1p(<\/span>15<\/span>)<\/span>)<\/span> \r\n\r\n<\/code><\/pre>\n
      \u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306e\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001\u5165\u529b\u8868\u73fe15\u306b\u5bfe\u3057\u3066\u3001(1 + 15)\u306e\u30ed\u30b0\u5024\u304c\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002<\/p>\n
      \u3064\u307e\u308a\u3001math.log1p(15)\u306fmath.log(16)\u3068\u540c\u3058\u3067\u3059\u3002<\/p>\n
      \u51fa\u529b<\/p>\n
      Log value(<\/span>1<\/span>+<\/span>15<\/span>)<\/span> for<\/span> x =<\/span> 15<\/span> is<\/span>:<\/span> \r\n2.772588722239781<\/span>\r\n<\/code><\/pre>\n
      \n
      Python NumPy\u3067\u306e\u30ed\u30b0\u30a4\u30f3\u306e\u7406\u89e3<\/h2>\n
      Python\u306eNumPy\u306f\u3001\u5165\u529b\u3055\u308c\u305fNumPy\u914d\u5217\u306e\u8981\u7d20\u306e\u81ea\u7136\u5bfe\u6570\u306e\u5024\u3092\u540c\u6642\u306b\u8a08\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
      numpy.log()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u3063\u3066NumPy\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
      import<\/span> numpy\r\n<\/code><\/pre>\n
      \u6587\u6cd5\uff1a<\/p>\n
      numpy.<\/span>log(<\/span>input_array)<\/span>\r\n<\/code><\/pre>\n
      numpy.log() \u95a2\u6570\u306f\u3001\u5165\u529b\u914d\u5217\u3092\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u3057\u3066\u53d7\u3051\u53d6\u308a\u3001\u305d\u306e\u8981\u7d20\u306e\u5bfe\u6570\u5024\u304c\u542b\u307e\u308c\u305f\u914d\u5217\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n
      \u3053\u306e\u672c\u306f\u3068\u3066\u3082\u9762\u767d\u304f\u3066\u3001\u8aad\u3080\u306e\u304c\u697d\u3057\u3044\u3067\u3059\u3002<\/p>\n
      import<\/span> numpy as<\/span> np \r\n\r\ninp_arr =<\/span> [<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>]<\/span> \r\nprint<\/span> (<\/span>\"Array input elements:\\n\"<\/span>,<\/span> inp_arr)<\/span> \r\n\r\nres_arr =<\/span> np.<\/span>log(<\/span>inp_arr)<\/span> \r\nprint<\/span> (<\/span>\"Resultant array elements:\\n\"<\/span>,<\/span> res_arr)<\/span> \r\n<\/code><\/pre>\n
      \u51fa\u529b\uff1a<\/p>\n
      Array input<\/span> elements:<\/span>\r\n [<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>]<\/span>\r\nResultant array elements:<\/span>\r\n [<\/span> 2.30258509<\/span>  2.99573227<\/span>  3.40119738<\/span>  3.68887945<\/span>  3.91202301<\/span>]<\/span>\r\n<\/code><\/pre>\n
      \n
      \u7d50\u8ad6<\/h2>\n
      \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Python\u306e\u30ed\u30b0\u95a2\u6570\u306e\u52d5\u4f5c\u3092\u7406\u89e3\u3057\u3001Python\u306e\u5bfe\u6570\u95a2\u6570\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n
      \n
      \u53c2\u8003\u6587\u732e<\/h2>\n
        \n
      • Python log function Documentation<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
        \u5bfe\u6570\u306f\u5927\u304d\u306a\u6570\u3092\u8868\u73fe\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u5bfe\u6570\u306f\u6307\u6570\u306e\u9006\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Python\u306elog()\u95a2\u6570\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u3059\u3002Python\u306e\u5bfe\u6570\u95a2\u6570\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u6570\u5b57\u306e\u5bfe\u6570\u3092\u3088\u308a\u7c21\u5358\u304b\u3064\u52b9\u7387\u7684\u306b\u898b\u3064\u3051\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059 […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[31,26],"class_list":["post-331","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-python","tag-26"],"yoast_head":"\nPython\u306elog()\u95a2\u6570\u306f\u5bfe\u6570\u3092\u8a08\u7b97\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002 - 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