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python np.DElEtE

厘勣樟屎容呪基宛嶄議傍隈 del旺音頁喘栖^評茅哈喘峺魑陳擺羶媼筺隠python嶄議del才c++嶄議delete頁頼畠曾倖古廷音勣列繁徨宮。。 匯違栖讐del頁喘栖評茅延楚議哈喘議箭泌a = 1; del a宸戦a頁斤1宸倖峙議哈喘python嶄侭嗤議延楚脅...

伏撹獏Υ麸ゝ珍秕慱鵤訟倖浅徨 -------- np.zeros(5)#伏撹淫根5倖圷殆議巣裳專 array([ 0., 0., 0., 0., 0.]) np.zeros((5,), dtype=np.int)#伏撹淫根5倖圷殆議巣裳專拝光圷殆葎屁侘 array([0, 0, 0, 0, 0]) np.zeros((2, 1))#伏撹2佩1双...

云栖祥音頁腎,峪頁隆兜兵晒議昧字峙 郊圭猟亀戦匯蝕遊祥嗤傍 http://docs.scipy.org/doc/numpy/reference/generated/numpy.empty.html

泣持曳泌np.dot([1,2,3],[4,5,6]) = 1*4 + 2*5 + 3*6 = 32

import numpy as np data = np.array([1,2,3,np.nan,4,np.nan]) # 資誼匯倖bool方怏 # array([False, False, False, True, False, True], dtype=bool) # 宸劔辛參資誼nan議方楚 np.isnan(data).sum() # 2

http://blog.csdn.net/rifengxxc/article/details/75008427

numpy.ndarray.shape 卦指匯倖方怏略業議圷怏 曳泌 import numpy as npx = np.array([1, 2])y = np.array([[1],[2]])print x.shapeprint y.shape>>>(2,)(2, 1) 廣 x[1,2]議shape峙(2,)吭房頁匯略方怏方怏嶄嗤2倖圷殆 y[[1],[2]]議shape峙...

numpy.ndarray.shape 卦指匯倖方怏略業議圷怏曳泌12345678import numpy as npx = np.array([1, 2])y = np.array([[1],[2]])print x.shapeprint y.shape>>>(2,)(2, 1)廣x[1,2]議shape峙(2,)吭房頁匯略方怏方怏嶄嗤2倖圷殆y[[1],[2]]議shape...

c = np.array([[[0, 1, 2,3], [4, 5, 6,7]], [[1, 2, 3,4], [5,6,7,8]]] print( c.sum(axis=0)) print( c.sum(axis=1)) print( c.sum(axis=2)) 匯倖音頁載酒汽徽頁載挫尖盾議圭隈頁債禝鎚簇訃慱鶺shape頁(2,2,4)椎担輝axis=0扮祥頁壓及...

import numpy as np#辛參岷俊喘std痕方a = np.arange(10)#array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])np.std(a)#2.8722813232690143#賜宀梓炎彈餓巷塀亟a = np.arange(10)#array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])mid = 0for i in mid: mid = mid + (...

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