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关于floor函数的作用:
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floor:朝负无穷方向舍入, I9 B) B$ d, t. e4 L: w& F
5 R0 r; @5 T+ _9 MB = floor(A) rounds the elements of A to the nearest integers less than or equal to A.7 G9 Y0 Y: d: V9 _2 D
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ceil:朝正无穷方向舍入
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# K2 d9 \% R# }B = ceil(A) rounds the elements of A to the nearest integers greater than or equal to A.9 d1 N2 m$ g3 n$ j, ~5 e
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fix:朝零方向舍入
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4 O, u# P# v7 s# R# EB = fix(A) rounds the elements of A toward zero, resulting in an array of integers.3 c, [8 P8 v: V
D. ?2 Z# y( T8 vround:四舍五入. F6 u- n* a; b* k5 t( w5 M; Y& J
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B = round(A) rounds the elements of X to the nearest integers. + G0 k$ O2 L0 l ]" ]
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norm:求矩阵或向量的泛数2 a8 n. K" M: [( X1 p! S+ _
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norm(x) = 9.5394
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Example:# T5 I; I7 T% W
$ k5 n& i) ?5 \6 b- w+ x" Z& qa= [-0.9, -2.1, -0.4, 0.3, 0.8, 1.1, 2.7, -1.2+2.9i];
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floor(a)=[ -1, -3, -1, 0, 0, 1, 2, -2+2i]
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. [! P; K: w$ z2 ]* N: fceil(a)= [ 0, -2, 0, 1, 1, 2, 3, -1+3i]
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fix(a)= [ 0, -2, 0, 0, 0, 1, 2, -1+2i]
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$ D; a+ A0 C/ X3 X: jround(a)=[-1, -2, 0, 0, 1, 1, 3, -1+3i]4 N: I3 w& f0 v* c- J& b
( R$ b* A8 c* d! J注:For complex X, for all the four fuctions the imaginary and real parts are rounded independently3 O' R. d! Y) L! M
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