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高速数値計算ライブラリ「Numpyã€è¦šæ›¸ã - Pashango’s Blog
Pythonã§ä¸€ç•ªæœ‰åã§æ™®åŠã—ã¦ã„るライブラリã¨è¨€ã£ã¦ã‚‚éŽè¨€ã§ã¯ãªã„「Numpyã€ã®è¦šæ›¸ãã§ã™ã€‚ã‹ãªã‚Šå¤šæ©Ÿèƒ½ãªæ•°å€¤è¨ˆç®—ライブラリã§ã€å†…部ã¯C言語ã§è¨˜è¿°ã•ã‚Œã¦ã„ã‚‹ãŸã‚超高速ã«å‹•ä½œã—ã¾ã™ã€‚ ベクトル ベクトルã®é•·ã•ï¼†æ£è¦åŒ– import numpy a = numpy.array([[2,2]]) #ベクトルã®é•·ã• length = numpy.linalg.norm(a) #length=>2.8284271247461903 #ベクトルã®æ£è¦åŒ– a / numpy.linalg.norm(a) #=>array([[ 0.70710678, 0.70710678]]) 内ç©ï¼†å¤–ç© import numpy v1 = numpy.array((1,0,0)) v2 = numpy.array((0,1,0)) #å†…ç© numpy.dot(v1,v2) #=> 0 #å¤–ç© numpy.cros
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