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关于floor函数的作用:! h* _9 V2 c7 k0 T6 \
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: @8 h4 K9 ]( k7 @4 sB = floor(A) rounds the elements of A to the nearest integers less than or equal to A., S! g. @* A* I8 c9 F
" C0 x! A* `5 \2 B& e# K# h2 jceil:朝正无穷方向舍入
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B = ceil(A) rounds the elements of A to the nearest integers greater than or equal to A.5 i1 x5 T# i3 D+ W1 P- Q( b
" w/ v) x+ ?+ t& ~# ~5 Xfix:朝零方向舍入' _# n9 i2 L% i5 j
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B = fix(A) rounds the elements of A toward zero, resulting in an array of integers.! D. e6 O' f% b; ~/ D- Q8 p
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round:四舍五入
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* M s; F( D# O* U+ _" LB = round(A) rounds the elements of X to the nearest integers. : Y6 d. i4 l4 Q; g8 r
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norm:求矩阵或向量的泛数
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x = [1 2 3 4 5 6];+ _" l1 ?' `- _( B/ S. D% s
6 _# K( O+ D( t: |, N- m3 u norm(x) = 9.5394! n8 F4 V: B7 x
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Example:
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) U& H. Z0 b$ V% {" Ia= [-0.9, -2.1, -0.4, 0.3, 0.8, 1.1, 2.7, -1.2+2.9i];$ l& X3 f, v% w2 g7 P
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floor(a)=[ -1, -3, -1, 0, 0, 1, 2, -2+2i]/ E: n* j8 S9 g* Y
8 G; L' m0 k: a0 q$ o4 gceil(a)= [ 0, -2, 0, 1, 1, 2, 3, -1+3i]
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& [/ Z3 ^: R+ Lfix(a)= [ 0, -2, 0, 0, 0, 1, 2, -1+2i]; ~1 }& q* I7 ?* p& S3 @ K e. {
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round(a)=[-1, -2, 0, 0, 1, 1, 3, -1+3i]
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/ k" _6 L. F) c* _2 J: j# O/ R( F注:For complex X, for all the four fuctions the imaginary and real parts are rounded independently9 S [1 K/ t8 Q7 r/ l; r: C
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