{"id":70027,"date":"2018-08-28T20:23:38","date_gmt":"2018-08-28T11:23:38","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=70027"},"modified":"2024-05-06T11:51:03","modified_gmt":"2024-05-06T02:51:03","slug":"70027","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/70027","title":{"rendered":"\u3010NumPy\u5165\u9580 np.log\u3011np.array\u306e\u5bfe\u6570\u3092\u8a08\u7b97\u3059\u308b\u95a2\u65704\u3064\u3092\u7d39\u4ecb"},"content":{"rendered":"

\u3053\u3093\u306b\u3061\u306f\uff01\u30a4\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc<\/a>\u306e\u30d5\u30af\u30ed\u30a6\u3067\u3059\u3002<\/p>\n

\u4e2d\u5b66\u9ad8\u6821\u3067\u7fd2\u3063\u305f\u5bfe\u6570<\/strong><\/span>\u3001\u7686\u3055\u3093\u899a\u3048\u3066\u3044\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u884c\u5217\u8a08\u7b97\u3092\u5f97\u610f\u3068\u3059\u308bNumPy<\/strong><\/span>\u306b\u3082\u3001\u3082\u3061\u308d\u3093\u5bfe\u6570\u95a2\u6570\u306e\u5b9f\u88c5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001NumPy\u306b\u5b9f\u88c5\u3055\u308c\u305f4\u3064\u306e\u5bfe\u6570\u95a2\u6570\u306b\u3064\u3044\u3066\u7d39\u4ecb<\/strong><\/span>\u3057\u3066\u3044\u304d\u307e\u3059\u3088\uff01<\/p>\n

\u5b9f\u306f\u6a5f\u68b0\u5b66\u7fd2\u306e\u5b9f\u88c5\u306b\u304a\u3044\u3066\u7121\u304f\u3066\u306f\u306a\u3089\u306a\u3044\u6a5f\u80fd\u3067\u3042\u308b\u5bfe\u6570\u3001NumPy\u306e\u52c9\u5f37\u3068\u4e00\u7dd2\u306b\u601d\u3044\u51fa\u3057\u3066\u307f\u307e\u305b\u3093\u304b\uff1f<\/p>\n

log\u306e\u4f7f\u3044\u65b9<\/h2>\n

\u203b\u3053\u306e\u8a18\u4e8b\u306e\u30b3\u30fc\u30c9\u306f\u3001jupyter notebook<\/a>\u3084juputer lab<\/a>\u3092\u4f7f\u3063\u3066\u66f8\u304b\u308c\u3066\u3044\u307e\u3059\u3002
\n\u30b3\u30fc\u30c9\u3092\u8a66\u3059\u3068\u304d\u306f\u662f\u975e\u3053\u308c\u3089\u3092\u4f7f\u3063\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

\u307e\u305a\u306f\u30e9\u30a4\u30d6\u30e9\u30ea\u3092import<\/strong><\/span>\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n

# \u30b3\u30fc\u30c9 In [1]:\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt<\/pre>\n
\u3055\u3066\u3001numpy\u306b\u306f\u5bfe\u6570\u306b\u95a2\u3059\u308b\u95a2\u6570\u304c4\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n
    \n
  • np.log(a)<\/span><\/strong>\n
      \n
    • \u5e95\u3092e\u3068\u3059\u308ba\u306e\u5bfe\u6570<\/span><\/strong><\/li>\n<\/ul>\n<\/li>\n
    • np.log2(a)<\/span><\/strong>\n
        \n
      • \u5e95\u30922\u3068\u3059\u308ba\u306e\u5bfe\u6570<\/span><\/strong><\/li>\n<\/ul>\n<\/li>\n
      • np.log10(a)<\/span><\/strong>\n
          \n
        • \u5e95\u309210\u3068\u3059\u308ba\u306e\u5bfe\u6570<\/span><\/strong><\/li>\n<\/ul>\n<\/li>\n
        • np.log1p(a)<\/span><\/strong>\n
            \n
          • \u5e95\u3092e\u3068\u3059\u308ba+1\u306e\u5bfe\u6570<\/span><\/strong><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
            \u305d\u308c\u305e\u308c\u3092\u6570\u5f0f\u3063\u307d\u304f\u66f8\u3044\u3066\u307f\u308b\u3068\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
            \"\"<\/p>\n
            \u57fa\u672c\u7684\u306b\u306f\u5bfe\u6570\u306e\u5e95\u304c\u5909\u308f\u3063\u305f\u3082\u306e<\/strong><\/span>\u304c\u53ce\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n
            NumPy\u3092\u4f7f\u3063\u3066\u3053\u308c\u3089\u306e\u5bfe\u6570\u95a2\u6570\u3092\u8a66\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u307e\u305a\u306f\u30b5\u30f3\u30d7\u30eb\u914d\u5217\u3092\u7528\u610f\u3057\u307e\u3059\u3002<\/p>\n
            # \u30b3\u30fc\u30c9 In [2]:\r\na = np.linspace(1,100,1000)<\/pre>\n
            \u3053\u306e\u914d\u5217\u306b\u5bfe\u3057\u3066\u3001\u5148\u7a0b\u7d39\u4ecb\u3057\u305f4\u3064\u306e\u5bfe\u6570\u95a2\u6570\u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n
            # \u30b3\u30fc\u30c9 In [3]:\r\nlog_a = np.log(a)\r\nlog2_a = np.log2(a)\r\nlog10_a = np.log10(a)\r\nlog1p_a = np.log1p(a)<\/pre>\n
            np.log\u7cfb\u306e\u95a2\u6570\u306f\u3001\u4ed6\u306eNumPy\u306e\u4e00\u822c\u7684\u306a\u95a2\u6570\u3068\u540c\u69d8\u306b\u3001\u914d\u5217\u306e\u8981\u7d20\u5168\u3066\u306b\u5bfe\u3057\u3066\u4f5c\u7528\u3057\u307e\u3059\u3002\u4e2d\u8eab\u3068\u305d\u306e\u30b0\u30e9\u30d5\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n
            # \u30b3\u30fc\u30c9 In [4]:\r\nprint(\"original\")\r\nprint(a[:10])\r\nprint(\"n log\")\r\nprint(log_a[:10])\r\nprint(\"n log2\")\r\nprint(log2_a[:10])\r\nprint(\"n log10\")\r\nprint(log10_a[:10])\r\nprint(\"n log1p\")\r\nprint(log1p_a[:10])<\/pre>\n
            # \u51fa\u529b\u7d50\u679c [4]:\r\noriginal\r\n[1.         1.0990991  1.1981982  1.2972973  1.3963964  1.4954955\r\n 1.59459459 1.69369369 1.79279279 1.89189189]\r\n\r\n log\r\n[0.         0.09449084 0.18081893 0.2602831  0.33389492 0.40245759\r\n 0.46661953 0.52691176 0.58377462 0.63757733]\r\n\r\n log2\r\n[0.         0.13632147 0.26086657 0.37550914 0.48170854 0.58062356\r\n 0.67318968 0.76017299 0.84220875 0.91982965]\r\n\r\n log10\r\n[0.         0.04103685 0.07852866 0.11303951 0.14500872 0.17478511\r\n 0.20265029 0.22883487 0.2535301  0.27689632]\r\n\r\n log1p\r\n[0.69314718 0.74150825 0.78763802 0.83173334 0.87396611 0.9144873\r\n 0.95343028 0.99091337 1.0270421  1.06191092]\r\n<\/pre>\n
            # \u30b3\u30fc\u30c9 In [5]:\r\nfig = plt.figure(figsize=(10,10))\r\n\r\nplt.plot(log_a, label=\"log_e\")\r\nplt.plot(log2_a, label=\"log_2\")\r\nplt.plot(log10_a, label=\"log_10\")\r\nplt.plot(log1p_a, label=\"log_1p\")\r\nplt.legend()<\/pre>\n
            # \u51fa\u529b\u7d50\u679c Out [5]:\r\n<\/pre>\n
            \n
            <\/div>\n
            <\/div>\n<\/div>\n
            \u5e95\u306e\u9055\u3044\u306b\u3088\u3063\u3066\u7d50\u69cb\u5024\u304c\u5909\u308f\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002\u305d\u308c\u306b\u5bfe\u3057\u3066\u3001log\u3068log1p\u306e\u5dee\u306f\u304b\u306a\u308a\u5c0f\u3055\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\n
            0\u4ee5\u4e0b\u306e\u5024\u3068\u5bfe\u6570\u306e\u95a2\u4fc2<\/h2>\n
            \u3055\u3066\u3001NumPy\u306e\u5bfe\u6570\u95a2\u6570\u5b9f\u88c5\u306b\u9650\u3089\u305a\u3001\u5bfe\u6570\u306f0\u4ee5\u4e0b\u306e\u8a08\u7b97\u304c\u3067\u304d\u307e\u305b\u3093<\/strong><\/span>\u30020\u306e\u5024\u3092\u5165\u308c\u308b\u3068-inf<\/strong><\/span>, \u30de\u30a4\u30ca\u30b9\u306e\u5024\u3092\u5165\u308c\u308b\u3068\u8a08\u7b97\u3067\u304d\u306a\u3044\u306e\u3067NaN<\/strong><\/span>\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n
            # \u30b3\u30fc\u30c9 In [6]:\r\nnp.log(np.linspace(-10,0,10))<\/pre>\n
            # \u51fa\u529b\u7d50\u679c [6]:\r\n\/root\/anaconda3\/lib\/python3.6\/site-packages\/ipykernel_launcher.py:1: RuntimeWarning: divide by zero encountered in log\r\n  \"\"\"Entry point for launching an IPython kernel.\r\n\/root\/anaconda3\/lib\/python3.6\/site-packages\/ipykernel_launcher.py:1: RuntimeWarning: invalid value encountered in log\r\n  \"\"\"Entry point for launching an IPython kernel.\r\n\r\narray([ nan,  nan,  nan,  nan,  nan,  nan,  nan,  nan,  nan, -inf])<\/pre>\n
            \u3053\u308c\u306b\u5bfe\u3057\u3066\u3001log1p\u3092\u4f7f\u3048\u30700\u3067\u3082\u8a08\u7b97\u3067\u304d\u307e\u3059<\/strong><\/span>\u3002\u203blog(0+1)\u3068\u306a\u308b\u306e\u3067\u3002<\/p>\n
            # \u30b3\u30fc\u30c9 In [7]:\r\nnp.log1p(0)<\/pre>\n
            # \u51fa\u529b\u7d50\u679c Out [7]:\r\n0.0<\/pre>\n
            # \u30b3\u30fc\u30c9 In [8]:\r\nnp.log1p(-1)<\/pre>\n
            # \u51fa\u529b\u7d50\u679c [8]:\r\n\/root\/anaconda3\/lib\/python3.6\/site-packages\/ipykernel_launcher.py:1: RuntimeWarning: divide by zero encountered in log1p\r\n  \"\"\"Entry point for launching an IPython kernel.\r\n\r\n-inf<\/pre>\n
            0\u3092\u542b\u3093\u3060\u6b63\u306e\u6570\u3092\u6271\u3046\u5834\u9762\u306f\u591a\u3044\u306e\u3067\u3001log1p\u306e\u4f7f\u3044\u6240\u306f\u4ee5\u5916\u306b\u3042\u308a\u305d\u3046\u3067\u3059\u306d\u3002<\/p>\n
            \u307e\u305f\u3001\u5192\u982d\u3067\u3082\u66f8\u304d\u307e\u3057\u305f\u304c\u3001\u6a5f\u68b0\u5b66\u7fd2\u3067\u306f\u5bfe\u6570\u3092\u4f7f\u3046\u5834\u5408\u304c\u591a\u3044<\/strong><\/span>\u3067\u3059\u3002\u4f8b\u3048\u3070\u78ba\u7387\u3092\u6271\u3046\u5834\u5408\u3001\u78ba\u7387\u306e\u5024\u306f\u6d6e\u52d5\u5c0f\u6570\u70b9\u6570\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
            \u305d\u306e\u307e\u307e\u78ba\u7387\u540c\u58eb\u3092\u639b\u3051\u7b97\u3059\u308b\u3068\u3001\u30a2\u30f3\u30c0\u30fc\u30d5\u30ed\u30fc\u304c\u304a\u3053\u3063\u3066\u8a08\u7b97\u304c\u3046\u307e\u304f\u3067\u304d\u306a\u3044<\/strong><\/span>\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3093\u306a\u6642\u3001\u5bfe\u6570\u306b\u76f4\u3057\u3066\u304b\u3089\u8db3\u3057\u7b97\u3092\u3059\u308c\u3070\u3001\u30a2\u30f3\u30c0\u30fc\u30d5\u30ed\u30fc\u306e\u5371\u967a\u6027\u3092\u5c0f\u3055\u304f\u3059\u308b<\/strong><\/span>\u4e8b\u304c\u3067\u304d\u307e\u3059\uff01\uff08\u5024\u306e\u30b9\u30b1\u30fc\u30eb\u611f\u3092\u3082\u3068\u306b\u623b\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u8a08\u7b97\u7d50\u679c\u3092exp\u95a2\u6570\u306b\u5165\u308c\u3066\u3042\u3052\u308c\u3070\u3044\u3044\u3067\u3059\u306d\u3002\uff09<\/p>\n
            \u307e\u305f\u3001\u6bd4\u8f03\u3057\u305f\u3044\u5168\u3066\u306e\u5024\u3092\u5bfe\u6570\u306b\u3057\u3066\u3082\u3001\u5927\u5c0f\u95a2\u4fc2\u306f\u5909\u308f\u3089\u306a\u3044\u306e\u3067\u3001\u4e0a\u8a18\u4ee5\u5916\u306e\u69d8\u3005\u306a\u5834\u6240\u3067\u5bfe\u6570\u306f\u5927\u6d3b\u8e8d\u3057\u307e\u3059\u3002<\/p>\n
            \u307e\u3068\u3081<\/h2>\n
            \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001NumPy\u306e\u5bfe\u6570\u95a2\u6570\u5b9f\u88c5\u306b\u3064\u3044\u3066\u7d39\u4ecb<\/strong><\/span>\u3057\u307e\u3057\u305f\u3002<\/p>\n
            \u5bfe\u6570\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3067\u306e\u8a08\u7b97\u3092\u5b89\u5168\u306b\u3057\u305f\u308a\u3001\u8a08\u7b97\u3092\u7c21\u5358\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5206\u91ce\u306b\u3088\u3063\u3066\u5e95\u304c\u5909\u308f\u308b\u3053\u3068\u304c\u591a\u3005\u3042\u308a\u307e\u3059\u304c\u3001NumPy\u306a\u3089\u3070\u57fa\u672c\u7684\u306a\u3082\u306e\u306f\u5168\u3066\u6291\u3048\u3066\u3044\u308b\u306e\u3067\u5b89\u5fc3\u3067\u3059\u3002<\/p>\n
            \u662f\u975e\u3053\u306e\u8a18\u4e8b\u3067\u3001np.log\u306a\u3069\u306e\u5bfe\u6570\u3092\u8a08\u7b97\u3059\u308b\u95a2\u6570\u306e\u4f7f\u3044\u304b\u305f\u3092\u899a\u3048\u3066\u3001\u6a5f\u68b0\u5b66\u7fd2\u3084\u79d1\u5b66\u8a08\u7b97\u306e\u5b9f\u88c5\u306b\u5f79\u7acb\u3066\u3066\u304f\u3060\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u3053\u3093\u306b\u3061\u306f\uff01\u30a4\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306e\u30d5\u30af\u30ed\u30a6\u3067\u3059\u3002 \u4e2d\u5b66\u9ad8\u6821\u3067\u7fd2\u3063\u305f\u5bfe\u6570\u3001\u7686\u3055\u3093\u899a\u3048\u3066\u3044\u308b\u3067\u3057\u3087\u3046\u304b\u3002\u884c\u5217\u8a08\u7b97\u3092\u5f97\u610f\u3068\u3059\u308bNumPy\u306b\u3082\u3001\u3082\u3061\u308d\u3093\u5bfe\u6570\u95a2\u6570\u306e\u5b9f\u88c5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001NumPy\u306b\u5b9f\u88c5\u3055\u308c\u305f4\u3064\u306e\u5bfe\u6570\u95a2\u6570\u306b\u3064 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