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Num py basic(2) - v01

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This is a command manual about Python NumPy - Basic(2) - V01.

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NumPy(2) Benson
NumPy(2) ￥互丼楕拝圭宴議親W麻議耗周. ￥戻工寄楚謹S裳才ﾝ痕塀. ￥圭宴ﾀ輜鯀拭⊂懆吉\麻 ￥淫根阻W、、電會、I/O x柊元羨~Q、児云來旗機∋云y\ 麻式SC庁M吉孔嬬
NumPy(2) (匯)芦b NumPy (屈)R秘(import) NumPy (眉)秀羨双c裳 (膨)双c裳議捐 (励)裳紗p核茅式児云\麻 (鎗)沫哈、俳頭、亨旗、栽禳遊峺 (鈍)view, shadow copy 才 deep copy \麻 (伊)了圷\麻 (湘)忖堪\麻 (噴)IO \麻 (噴匯)來旗掬cy
NumPy(2) (鎗)沫哈、俳頭、亨旗、栽禳遊峺 ============= =============================== character description ============= =============================== 沫哈 圷殆議了崔,邑^沫哈辛參函誼議圷殆峙 俳頭 c沫哈載貌,圭宴酔堀紋Q沫哈議圷殆 亨旗 戻工來議圭塀輳L侭嗤議圷殆 栽 裳岻g恂栽禹鰡BY,嗤換岷才邦峠圭鮑 蛍護 裳岻g卆音揖S鰈俳護,圭塀嗤換岷才邦峠圭 蛍護 ===================================================
NumPy(2) 沫哈: 圷殆議了崔 [圭隈]: 沫哈議軟泌峙 0,辛卆會f奐,賜榒扈K峙-1,卆會fp. 1)a[index_a]:x函沫哈 index_a 議圷殆 2)a[index_a:index_b]:x函Bm^g沫哈 index_a 欺 index_b+1 議圷殆 [箭 1]: a = [2,4,6,8,10,12,14,16,18,20],函誼沫哈 index_a=2 議圷殆峙. In [1]: a = np.array([2,4,6,8,10,12,14,16,18,20]) In [2]: a[2] Out[2]: 6
NumPy(2) [箭 2]: a = [2,4,6,8,10,12,14,16,18,20],函誼沫哈 index_a=2 欺 index_b=5 參式 index_a=-5 欺 index_b=-1 侭議圷殆峙,. In [1]: a = np.array([2,4,6,8,10,12,14,16,18,20]) In [2]: a[2:5] Out[2]: array([ 6, 8, 10]) In [3]: a[-5:-1] Out[3]: array([12, 14, 16, 18])
NumPy(2) 俳頭: 紋Q了崔議圷殆 [圭隈]: [index_s:index_e:index_c], index_s:軟兵議沫哈,index_e: Y崩議沫哈,index_c:紋Q侯及ﾗ沫哈議圷殆峙. [箭 1]: a = [2,4,6,8,10,12,14,16,18,20],軟兵沫哈 0,Y崩沫哈 9,∨哈 2 議蔚桔議圷殆峙譲紋Q 66. In [1]: a = np.array([2,4,6,8,10,12,14,16,18,20]) In [2]: a[0:9:2]=66 In [2]: print(a) [66 4 66 8 66 12 66 16 66 20]
NumPy(2) [箭 2]: a = [2,4,6,8,10,12,14,16,18,20],∬双議圷殆恂宜會. In [1]: a = np.array([2,4,6,8,10,12,14,16,18,20]) In [2]: a[::-1] Out[2]: array([20, 18, 16, 14, 12, 10, 8, 6, 4, 2]) In [3]: a[::1] Out[3]: array([ 2, 4, 6, 8, 10, 12, 14, 16, 18, 20])
NumPy(2) 亨旗: L侭嗤議圷殆 [圭隈]: for i in array:,邑^筈議圭塀輳L双賜裳議侭嗤圷殆. [箭 1]: a = [2,4,6,8,10,12,14,16,18,20],\喘亨旗輳L侭嗤議 圷殆. In [1]: a = np.array([2,4,6]) In [2]: for i in a: print(i) 2 4 6
NumPy(2) [箭 2]: a = [2,4][8,10],\喘亨旗輳L侭嗤議圷殆. In [1]: a = np.array([[2,4],[8,10]]) In [2]: for i in a: print(i) [2 4] [ 8 10] In [3]: for i in a.flat: print(i) 2 4 8 10
NumPy(2) 栽: 裳岻g恂栽禹鰡BY [圭隈]: *換岷圭鮑 np.vstack(), or np.concatenate(axis = 0) *邦峠圭鮑 np.hstack(), or np.concatenate(axis = 1)
NumPy(2) [箭 1]: a = [2,4][6,8], b = [10,12][14,16],\喘 np.vstack(), 才 np.concatenate(axis = 0) a 才 b 恂換岷圭鮑 In [1]: a = np.array([[2,4],[6,8]]) In [2]: b = np.array([[10,12],[14,16]]) In [3]: np.vstack((a, b)) Out[3]: array([[ 2, 4], [ 6, 8], [10, 12], [14, 16]])
NumPy(2) In [4]: np.concatenate((a, b), axis = 0) Out[4]: array([[ 2, 4], [ 6, 8], [10, 12], [14, 16]])
NumPy(2) [箭 2]: a = [2,4][6,8], b = [10,12][14,16],\喘 np.hstack(), 才 np.concatenate(axis = 1) a 才 b 恂邦峠圭鮑 In [1]: a = np.array([[2,4],[6,8]]) In [2]: b = np.array([[10,12],[14,16]]) In [3]: np.hstack((a, b)) Out[3]: array([[ 2, 4, 10, 12], [ 6, 8, 14, 16]]) In [4]: np.concatenate((a, b), axis = 1) Out[4]: array([[ 2, 4, 10, 12], [ 6, 8, 14, 16]])
NumPy(2) 蛍護: 裳岻g卆音揖S鰈俳護 [圭隈]: *換岷圭魴峺 np.vsplit(), or np.split(axis = 0) *邦峠圭魴峺 np.hsplit(), or np.split(axis = 1)
NumPy(2) [箭 1]: a = [2,4,6,8][10,12,14,16][18,20,22,24],\喘 np.vsplit(), 才 np.split(axis = 0) a 恂換岷圭魴峺 In [1]: a=np.array([[2,4,6,8],[10,12,14,16],[18,20,22,24]]) In [2]: np.vsplit(a, 3) Out[2]: [array([[2, 4, 6, 8]]), array([[10, 12, 14, 16]]), array([[18, 20, 22, 24]])] In [3]: np.split(a, 3, axis = 0) Out[3]: [array([[2, 4, 6, 8]]), array([[10, 12, 14, 16]]), array([[18, 20, 22, 24]])]
NumPy(2) [箭 2]: a = [2,4,6,8][10,12,14,16][18,20,22,24],\喘 np.hsplit(), 才 np.split(axis = 1) a 恂邦峠圭魴峺 In [1]: a=np.array([[2,4,6,8],[10,12,14,16],[18,20,22,24]]) In [2]: np.hsplit(a, 2) Out[2]: [array([[ 2, 4], [10, 12], [18, 20]]), array([[ 6, 8], [14, 16], [22, 24]])]
NumPy(2) In [3]: np.split(a, 2, axis = 1) Out[3]: [array([[ 2, 4], [10, 12], [18, 20]]), array([[ 6, 8], [14, 16], [22, 24]])]
NumPy(2) (鈍)view, shadow copy 才 deep copy \麻 ============= =============================== character description ============= =============================== view 秀匯仟議裳,俐個圷殆峙厚個圻兵裳議圷 殆峙,徽俐個S業K音厚個圻兵裳議S業 shadow copy 秀匯仟議裳,俐個圷殆峙才S業厚個圻兵裳 議圷殆峙才S業 deep copy 秀匯仟議裳,俐個圷殆峙才S業K音厚個圻 兵裳議圷殆峙才S業 ===================================================
NumPy(2) view: 俐個圷殆峙厚個圻兵裳議圷殆峙,徽俐個S業K音厚個圻兵裳 議S業. [圭隈]: b = a.view() [箭 1]: \喘 view()秀匯仟議裳,K俐個圷殆峙才S業. In [1]: a = np.arange(5) In [2]: b_view = a.view() In [3]: b_view.shape = 5,1 In [4]: b_view[0] = 999
NumPy(2) In [5]: print('a=',a) a= [999 1 2 3 4] In [6]: print('b_view=n',b_view) b_view= [[999] [ 1] [ 2] [ 3] [ 4]]
NumPy(2) shadow copy: 俐個圷殆峙才S業厚個圻兵裳議圷殆峙才S業. [圭隈]: b = a [箭 1]: \喘 shadow copy 秀匯仟議裳,K俐個圷殆峙才S業. In [1]: a = np.arange(5) In [2]: b = a In [3]: b.shape = 5,1 In [4]: b[0] = 999 In [5]: print('a=',a)
NumPy(2) a= [[999] [ 1] [ 2] [ 3] [ 4]] In [6]: print('b=n',b) b_view= [[999] [ 1] [ 2] [ 3] [ 4]]
NumPy(2) deep copy: 俐個圷殆峙才S業K音厚個圻兵裳議圷殆峙才S業. [圭隈]: b = a.copy() [箭 1]: \喘 copy()秀匯仟議裳,K俐個圷殆峙才S業. In [1]: a = np.arange(5) In [2]: b_copy = a.copy() In [3]: b_copy.shape = 5,1 In [4]: b_copy[0] = 999
NumPy(2) In [5]: print('a=',a) a= [0 1 2 3 4] In [6]: print('b_copy=n',b_copy) b_copy= [[999] [ 1] [ 2] [ 3] [ 4]]
NumPy(2) (伊)了圷\麻 ============= =============================== character description ============= =============================== bitwise_and 裳圷殆茂侘市 And 荷恬 bitwise_or 裳圷殆茂侘市 Or 荷恬 invert 梓了圷函郡 left_shift 屈M崙燕幣議了圷鰈麭 right_shift 屈M崙燕幣議了圷鰉厰 ===================================================
NumPy(2) bitwise_and: 茂侘市 And 荷恬. [圭隈]: np.bitwise_and() [箭 1]: a = 10, b = 15,\喘 np.bitwise_and a 才 b 恂屈M崙 and 議\麻. In [1]: a = 10 In [2]: b = 15 In [3]: np.bitwise_and(a, b) Out[4]: 10
NumPy(2) bitwise_or: 茂侘市 Or 荷恬. [圭隈]: np.bitwise_or() [箭 1]: a = 10, b = 15,\喘 np.bitwise_or a 才 b 恂屈M崙 or 議\麻. In [1]: a = 10 In [2]: b = 15 In [3]: np.bitwise_or(a, b) Out[4]: 15
NumPy(2) invert: 茂侘市郡魏掀. [圭隈]: np.invert() [f苧]: * 10 M崙議久巖DQ撹 2 M崙,K函郡,1 0,0 1. *泌惚恷互了圷 1,燕幣蚰 *茅阻恷互了圷隠隔音,凪N了圷壅函郡,Kψ邉洋市壅恂紗 1 議嘛 *壅DQ撹 10 M崙
NumPy(2) [箭 1]: a = 10,\喘 np.invert a 恂屈M崙郡鰡\麻. In [1]: a = 10 In [2]: bin(a) Out[2]: '0b1010' In [3]: bin(np.invert(a)) Out[3]: '-0b1011' In [4]: np.invert(a) Out[4]: -11
NumPy(2) left_shift: 屈M崙燕幣議了圷鰈麭 [圭隈]: np.left_shift() [箭 1]: a = 10,\喘 left_shift a 議屈M崙了圷鰈麭 2 了圷. In [1]: a = 10 In [2]: bin(a) Out[2]: '0b1010' In [3]: np.left_shift(a, 2) Out[3]: 40
NumPy(2) In [4]: bin(np.left_shift(a, 2)) Out[4]: '0b101000'
NumPy(2) right_shift: 屈M崙燕幣議了圷鰉厰 [圭隈]: np.right_shift() [箭 1]: a = 10,\喘 right_shift a 議屈M崙了圷鰉厰 2 了圷. In [1]: a = 10 In [2]: bin(a) Out[2]: '0b1010' In [3]: np.right_shift(a, 2) Out[3]: 2
NumPy(2) In [4]: bin(np.right_shift(a, 2)) Out[4]: '0b10'
NumPy(2) (湘)忖堪\麻 ￥壓 NumPy 匆嗤S謹議痕疑敏茂俔峇荷恬,初B械喘議痕. ============= =============================== character description ============= =============================== char.add 双M佩忖堪B俊 char.multiply 茂亢犂臨峇B俊 char.center 喜塘峺協議忖憲豢忖堪議念瘁 char.capitalize 忖堪議及匯忖銚DQ撹寄忖銚 char.title 忖堪嶄耽臨峙諜斷忖銚脅DQ撹寄忖銚
NumPy(2) char.lower 忖堪嶄議耽忖圷脅DQ撹弌忖銚 char.upper 忖堪嶄議耽忖圷脅DQ撹寄忖銚 char.split 參峺協憲ψ峇恂蛍護撹圷殆 char.splitlines 參Q佩憲ψ峇恂蛍護撹圷殆 char.strip 卞茅圷殆議_^才Y硫議蒙協忖圷賜憲 char.join 參峺協議憲躔峺式B俊双嶄議耽圷殆忖 char.replace 聞喘仟議忖堪賜憲輒Q圷殆嶄圻云議忖堪 char.encode 忖堪DQ撹ｴa瘁議忖圷才憲 char.decode 忖堪M佩盾a ===================================================
NumPy(2) char.add: 双M佩忖堪B俊 [圭隈]: np.char.add() [箭 1]: a = I m, b= Benson,\喘 np.char.add a 才 b 恂忖堪B俊. In [1]: a = 'I am' In [2]: b = ' Benson' In [3]: np.char.add(a,b) Out[3]: array('I am Benson', dtype='<U11')
NumPy(2) char.multiply: 茂亢犂臨峇B俊 [圭隈]: np.char.multiply() [箭 1]: a = Hello! ,\喘 np.char.multiply a 恂 3 肝忖堪B俊. In [1]: a = 'Hello! ' In [2]: np.char.multiply(a,3) Out[2]: array('Hello! Hello! Hello! ', dtype='<U21')
NumPy(2) char.center: 忖堪崔豢嶄g,K參峺協議憲a割壓忖堪議念瘁匯岷欺侭 O協議L業. [圭隈]: np.char.center() [箭 1]: a = Hello!,\喘 np.char.center 參=議憲 a 忖堪念瘁野 M撹 20 忖圷. In [1]: a = 'Hello!' In [2]: np.char.center(a, 20, '=') Out[2]: array('=======Hello!=======', dtype='<U20')
NumPy(2) char.capitalize: 忖堪議及匯忖銚DQ撹寄忖銚. [圭隈]: np.char.capitalize() [箭 1]: a = i am Benson.,\喘 np.char.capitalize a 忖堪議及 匯忖銚DQ撹寄忖銚. In [1]: a = 'i am Benson.' In [2]: np.char.capitalize(a) Out[2]: array('I am benson.', dtype='<U12')
NumPy(2) char.title: 忖堪嶄議耽臨峙諜斷忖銚脅DQ撹寄忖銚. [圭隈]: np.char.title() [箭 1]: a = i am benson.,\喘 np.char.title a 忖堪嶄議耽 忖議及匯忖銚脅DQ撹寄忖銚. In [1]: a = 'i am benson.' In [2]: np.char.title(a) Out[2]: array('I Am Benson.', dtype='<U12')
NumPy(2) char.lower: 忖堪嶄議耽忖圷脅DQ撹弌忖銚. [圭隈]: np.char.lower() [箭 1]: a = I AM BENSON.,\喘 np.char.lower a 忖堪嶄議耽忖 圷脅DQ撹弌忖銚. In [1]: a = 'I AM BENSON.' In [2]: np.char.lower(a) Out[2]: array('i am benson.', dtype='<U12')
NumPy(2) char.upper: 忖堪嶄議耽忖圷脅DQ撹寄忖銚. [圭隈]: np.char.upper() [箭 1]: a = i am benson.,\喘 np.char.upper a 忖堪嶄議耽忖 圷脅DQ撹寄忖銚. In [1]: a = 'i am benson.' In [2]: np.char.upper(a) Out[2]: array('I AM BENSON.', dtype='<U12')
NumPy(2) char.split: 參峺協憲ψ峇恂蛍護撹圷殆. [圭隈]: np.char.split() [箭 1]: a = i,am,benson.,\喘 np.char.split a 忖堪參,憲 忖堪恂蛍護撹圷殆. In [1]: a = 'i,am,benson.' In [2]: np.char.split(a, ',') Out[2]: array(list(['i', 'am', 'benson.']), dtype=object)
NumPy(2) char.splitlines: 參Q佩憲ψ峇恂蛍護撹圷殆. [圭隈]: np.char.splitlines() [箭 1]: a = I am Benson.,\喘 np.char.splitlines a 忖堪參Q 佩憲/n, or /r 蛍護撹圷殆. In [1]: a = 'InamrBenson.' In [2]: np.char.splitlines(a) Out[2]: array(list(['I', 'am', 'Benson.']), dtype=object)
NumPy(2) char.strip: 卞茅圷殆議_^才Y硫議蒙協忖圷賜憲. [圭隈]: np.char.strip() [箭 1]: a = mI am Benson.m,\喘 np.char.strip a 忖堪議_^才 Y硫 m 忖圷卞茅. In [1]: a = 'mI am Benson.m' In [2]: np.char.strip(a, 'm') Out[2]: array('I am Benson.', dtype='<U14')
NumPy(2) char.join: 參峺協議憲躔峺式B俊双嶄議耽圷殆忖圷. [圭隈]: np.char.join() [箭 1]: a = Hi!, I am Benson.,\喘 np.char.join a 忖堪嶄議耽 忖圷脅參-憲恂蛍侯式B俊. In [1]: a = ['Hi!', 'I am Benson.'] In [2]: np.char.join('-', a) Out[2]: array(['H-i-!', 'I- -a-m- -B-e-n-s-o-n-.'], dtype='<U23')
NumPy(2) [箭 2]: a = Hi!, I am Benson.,\喘 np.char.join a 忖堪嶄議及 匯圷殆議耽忖圷脅參/憲恂蛍侯式B俊, 及屈圷殆議耽忖圷脅參#憲 恂蛍侯式B俊. In [1]: a = ['Hi!', 'I am Benson.'] In [2]: np.char.join(['/', '#'], a) Out[2]: array(['H/i/!', 'I# #a#m# #B#e#n#s#o#n#.'], dtype='<U23')
NumPy(2) char.replace: 聞喘仟議忖堪賜憲輒Q圷殆嶄圻云議忖堪. [圭隈]: np.char.replace() [箭 1]: a = Hi!, I am Benson.,\喘 np.char.replace a 忖堪嶄 Hi!忖圷憲DQ撹 Hello!. In [1]: a = ['Hi!', 'I am Benson.'] In [2]: np.char.replace(a, 'Hi!', 'Hello!') Out[2]: array(['Hello!', 'I am Benson.'], dtype='<U12')
NumPy(2) char.encode: 忖堪DQ撹ｴa瘁議忖圷才憲. [圭隈]: np.char.encode() [箭 1]: a = Hi!, I am Benson.,\喘 np.char.encode a 忖堪D Q撹ｴa瘁議忖圷才憲,聞喘議頁 cp500 議ｴa. In [1]: a = ['Hi!', 'I am Benson.'] In [2]: np.char.encode(a, 'cp500') Out[2]: array([b'xc8x89O', b'xc9@x81x94@xc2x85x95xa2x96x95K'], dtype='|S12')
NumPy(2) char.decode: 忖堪M佩盾a. [圭隈]: np.char.decode() [箭 1]: a = [b'xc8x89O', b'xc9@x81x94@xc2x85x95xa2x96x95K'],\喘 np.char.decode a 忖堪DQ撹盾a瘁議忖憲,聞喘議頁 cp500 議ｴa. In [1]: a = [b'xc8x89O', b'xc9@x81x94@xc2x85x95xa2x96x95K'] In [2]: np.char.decode(a, 'cp500') Out[2]: array(['Hi!', 'I am Benson.'], dtype='<U12')
NumPy(2) (噴)IO \麻 ￥壓 NumPy 匆嗤辛參岷俊ξ勅M佩x函參式議痕,初B械喘議痕. ============= =============================== character description ============= =============================== save 裳崛猟周嶄,険n兆.npy load x函猟周嶄議Y創,険n兆.npy savze 謹裳崛猟周嶄,険n兆.npz savetxt 裳崛猟周嶄,険n兆.txt loadtxt x函猟周嶄議Y創,険n兆.txt ===================================================
NumPy(2) save: 裳崛猟周嶄,険n兆.npy. [圭隈]: np.save() [箭 1]: a = [2,4,6,8,10],邑^ np.save ∬双 a 秘欺 np_save_outfile.npy n宛嶄. In [1]: a = np.array([2,4,6,8,10]) In [2]: np.save('np_save_outfile.npy', a)
NumPy(2) load: x函猟周嶄議Y創,険n兆.npy. [圭隈]: np.load() [箭 1]: 邑^ np.load x函n宛 np_save_outfile.npy 嶄議Y創. In [1]: np.load('np_save_outfile.npy') Out[2]: array([ 2, 4, 6, 8, 10])
NumPy(2) savez: 謹裳崛猟周嶄,険n兆.npz. [圭隈]: np.savez() [箭 1]: a = [2,4,6,8,10], b = [1,3,4,5,9]才 c = [2,14,16,18,20], 邑^ np.savez ∬双 a,b,才 c 脅秘欺 np_savez_outfile.npz n宛嶄. In [1]: a = np.array([2,4,6,8,10]) In [2]: b = np.array([1,3,5,7,9]) In [3]: c = np.array([2,14,16,18,20]) In [4]: np.savez('np_savez_outfile.npz', a, b, c)
NumPy(2) 旋喘 np.load 迺C謹裳秘欺 np_savez_outfile.npz 議犯. In [5]: file_data = np.load("np_savez_outfile.npz") In [6]: file_data['arr_0'] Out[6]: array([ 2, 4, 6, 8, 10]) In [7]: file_data['arr_1'] Out[7]: array([1, 3, 5, 7, 9]) In [8]: file_data['arr_2'] Out[8]: array([ 2, 14, 16, 18, 20])
NumPy(2) savetxt: 裳崛猟周嶄,険n兆.txt. [圭隈]: np.savetxt() [箭 1]: a = [2,4,6,8,10],邑^ np.savetxt ∬双 a 秘欺 np_save_outfile.txt n宛嶄. In [1]: a = np.array([2,4,6,8,10]) In [2]: np.savetxt('np_save_outfile.txt', a)
NumPy(2) loadtxt: x函猟周嶄議Y創,険n兆.txt. [圭隈]: np.loadtxt() [箭 1]: 邑^ np.loadtxt x函n宛 np_save_outfile.txt 嶄議Y創. In [1]: np.loadtxt('np_save_outfile.txt') Out[2]: array([ 2., 4., 6., 8., 10.])
NumPy(2) (噴匯)來旗掬cy ￥壓 NumPy 匆嗤辛參岷俊ξ勅M佩x函參式議痕,初B械喘議痕. ============= =============================== character description ============= =============================== dot 裳恂ce(鳩e) vdot 鯀迅ce(鳩e) inner 互S業裳S貧議才e cross 裳恂我e outer 裳恂翌e matmul 裳議核e
NumPy(2) linalg.det 麻秘裳議佩双塀 linalg.solve 麻來圭殻塀議 x 盾 linalg.inv 麻裳核隈剃裳 amin 裳嶄峺協參佩賜參双議恷弌峙 amax 裳嶄峺協參佩賜參双議恷寄峙 ptp 裳嶄峺協參佩賜參双議恷寄峙-恷弌峙 percentile 裳嶄電會岻瘁參佩賜參双薺,K竃為蛍曳 議圷殆峙 ===================================================
NumPy(2) dot: 裳恂ce(鳩e). [圭隈]: np.dot() [箭 1]: a = [1, 2, 3],[3, 4, 5],[5, 6, 7], b = [2, 4, 6],[6, 8, 10],[10, 12, 14],\喘 np.dot 輦麻鳩e. In [1]: a = np.array([[1, 2, 3],[3, 4, 5],[5, 6, 7]]) In [2]: b = np.array([[2, 4, 6],[6, 8, 10],[10, 12, 14]]) In [3]: np.dot(a,b)
NumPy(2) Out[3]: array([[ 44, 56, 68], [ 80, 104, 128], [116, 152, 188]])
NumPy(2) vdot: 鯀迅ce(鳩e). [圭隈]: np.vdot() [箭 1]: a = [1, 2, 3],[3, 4, 5],[5, 6, 7], b = [2, 4, 6],[6, 8, 10],[10, 12, 14],\喘 np.vdot 輦麻鳩e. In [1]: a = np.array([[1, 2, 3],[3, 4, 5],[5, 6, 7]]) In [2]: b = np.array([[2, 4, 6],[6, 8, 10],[10, 12, 14]]) In [3]: np.vdot(a,b) Out[3]: 348
NumPy(2) inner: 互S業裳S貧議才e. [圭隈]: np.inner() [箭 1]: a = [1, 2, 3],[3, 4, 5],[5, 6, 7], b = [2, 4, 6],[6, 8, 10],[10, 12, 14],\喘 np.inner 輦麻壓互S業S貧議才e. In [1]: a = np.array([[1, 2, 3],[3, 4, 5],[5, 6, 7]]) In [2]: b = np.array([[2, 4, 6],[6, 8, 10],[10, 12, 14]]) In [3]: np.inner(a,b)
NumPy(2) Out[3]: array([[ 28, 52, 76], [ 52, 100, 148], [ 76, 148, 220]])
NumPy(2) cross: 鯀迅我e. [圭隈]: np.cross() [箭 1]: a = [11, 2, 3],[13, 4, 5],[15, 6, 7], b = [2, 14, 6],[6, 18, 10],[10, 22, 14],\喘 np.cross 輦麻我e. In [1]: a = np.array([[11, 2, 3],[13, 4, 5],[15, 6, 7]]) In [2]: b = np.array([[2, 14, 6],[6, 18, 10],[10, 22, 14]]) In [3]: np.cross(a,b)
NumPy(2) Out[3]: array([[ -30, -60, 150], [ -50, -100, 210], [ -70, -140, 270]])
NumPy(2) outer: 鯀迅翌e. [圭隈]: np.outer() [箭 1]: a = [11, 2, 3],[13, 4, 5],[15, 6, 7], b = [2, 14, 6],[6, 18, 10],[10, 22, 14],\喘 np.outer 輦麻翌e. In [1]: a = np.array([[11, 2, 3],[13, 4, 5],[15, 6, 7]]) In [2]: b = np.array([[2, 14, 6],[6, 18, 10],[10, 22, 14]]) In [3]: np.outer(a,b)
NumPy(2) Out[3]: array([[ 22, 154, 66, 66, 198, 110, 110, 242, 154], [ 4, 28, 12, 12, 36, 20, 20, 44, 28], [ 6, 42, 18, 18, 54, 30, 30, 66, 42], [ 26, 182, 78, 78, 234, 130, 130, 286, 182], [ 8, 56, 24, 24, 72, 40, 40, 88, 56], [ 10, 70, 30, 30, 90, 50, 50, 110, 70], [ 30, 210, 90, 90, 270, 150, 150, 330, 210], [ 12, 84, 36, 36, 108, 60, 60, 132, 84], [ 14, 98, 42, 42, 126, 70, 70, 154, 98]])
NumPy(2) matmul: 裳議核e. [圭隈]: np.matmul() [箭 1]: a = [1, 2, 3],[3, 4, 5],[5, 6, 7], b = [2, 4, 6],[6, 8, 10],[10, 12, 14],\喘 np.matmul 輦麻壓核e. In [1]: a = np.array([[1, 2, 3],[3, 4, 5],[5, 6, 7]]) In [2]: b = np.array([[2, 4, 6],[6, 8, 10],[10, 12, 14]]) In [3]: np.matmul(a,b)
NumPy(2) Out[3]: array([[ 44, 56, 68], [ 80, 104, 128], [116, 152, 188]])
NumPy(2) linalg.det: 麻秘裳議佩双塀. [圭隈]: np.linalg.det() [箭 1]: a = [2, 2, 3],[3, 8, 5],[5, 6, 14],\喘 linalg.det 輦麻壓佩双塀. In [1]: a = np.array([[2, 2, 3],[3, 8, 5],[5, 6, 14]]) In [2]: np.linalg.det(a) Out[2]: 64.00000000000003
NumPy(2) linalg.solve: 麻來圭殻塀議 x 盾. [圭隈]: np.linalg.solve() [箭 1]: a = [2, 4],[3, 5],b = [8, 14],\喘 linalg.solve 輦 麻 ax=b 議來圭殻塀議盾. In [1]: a = np.array([[2, 4],[3, 5]]) In [2]: b = np.array([8, 14]) In [3]: x = np.linalg.solve(a, b) In [4]: print(x) [ 8. -2.]
NumPy(2) linalg.inv: 麻裳核隈剃裳. [圭隈]: np.linalg.inv() [箭 1]: a = [2, 4],[3, 5],\喘 linalg.inv 輦麻核隈剃裳. In [1]: a = np.array([[2, 4],[3, 5]]) In [2]: np.linalg.inv(a) Out[2]: array([[-2.5, 2. ], [ 1.5, -1. ]])
NumPy(2) amin(): 裳嶄峺協參佩賜參双議恷弌峙 [圭隈]: amin() [箭 1]: a = [2,4,6][8,10,12][14,16,18],\喘 np.amin()輦麻 恷弌議圷殆峙,佩議恷弌峙才双議恷弌峙. In [1]: a = np.array([[2,4,6],[8,10,12],[14,16,18]]) In [2]: print(a) array([[ 2, 4, 6], [ 8, 10, 12], [14, 16, 18]])
NumPy(2) In [3]: np.amin(a) Out[3]: 2 In [4]: np.amin(a, 0) Out[4]: array([2, 4, 6]) In [5]: np.amin(a, 1) Out[5]: array([ 2, 8, 14])
NumPy(2) amax(): 裳嶄峺協參佩賜參双議恷寄峙 [圭隈]: amax() [箭 1]: a = [2,4,6][8,10,12][14,16,18],\喘 np.amax()輦麻 恷寄議圷殆峙,佩議恷寄峙才双議恷寄峙. In [1]: a = np.array([[2,4,6],[8,10,12],[14,16,18]]) In [2]: print(a) array([[ 2, 4, 6], [ 8, 10, 12], [14, 16, 18]])
NumPy(2) In [3]: np.amax(a) Out[3]: 18 In [4]: np.amax(a, 0) Out[4]: array([14, 16, 18]) In [5]: np.amax(a, 1) Out[5]: array([ 6, 12, 18])
NumPy(2) ptp(): 裳嶄峺協參佩賜參双議恷寄峙-恷弌峙 [圭隈]: ptp() [箭 1]: a = [2,4,6][8,10,12][14,16,18],\喘 np.ptp()輦麻恷 寄議圷殆峙,佩議恷寄峙才双議恷寄峙-恷弌峙. In [1]: a = np.array([[2,4,6],[8,10,12],[14,16,18]]) In [2]: print(a) array([[ 2, 4, 6], [ 8, 10, 12], [14, 16, 18]])
NumPy(2) In [3]: np.ptp(a) Out[3]: 16 In [4]: np.ptp(a, 0) Out[4]: array([12, 12, 12]) In [5]: np.ptp(a, 1) Out[5]: array([4, 4, 4])
NumPy(2) percentile(): 裳嶄電會岻瘁參佩賜參双,K竃為蛍曳議圷殆峙 [圭隈]: percentile() [箭 1]: a = [2,4,6][8,10,12][14,16,18],\喘 np.percentile() 輦麻為蛍曳議圷殆峙. In [1]: a = np.array([[2,4,6],[8,10,12],[14,16,18]]) In [2]: print(a) array([[ 2, 4, 6], [ 8, 10, 12], [14, 16, 18]])
NumPy(2) In [3]: np.percentile(a, 50) Out[3]: 10.0 In [4]: np.percentile(a, 50, 0) Out[4]: array([ 8., 10., 12.]) In [5]: np.percentile(a, 50, 1) Out[5]: array([ 4., 10., 16.])
NumPy(2) Reference: http://www.numpy.org/

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