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关于floor函数的作用:; g* I- O$ D3 x' U. P
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$ _- p( }( D3 N5 ^$ xB = floor(A) rounds the elements of A to the nearest integers less than or equal to A." N0 C' P. j; W; A3 H
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ceil:朝正无穷方向舍入* l( V+ R# [% Z) |6 r' p- |+ f7 }
/ i" s# f' p6 b* O; _* aB = ceil(A) rounds the elements of A to the nearest integers greater than or equal to A.' T5 y) p. [# f2 r
# C$ D( I J, K0 a4 Z2 F9 e. a$ Hfix:朝零方向舍入
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B = fix(A) rounds the elements of A toward zero, resulting in an array of integers.% V3 D' ^$ ^9 U; h4 l' w
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round:四舍五入1 F l! \, V) P" s# f- l8 K- M0 Z
" _1 _* P. d; l+ O& X+ ?7 bB = round(A) rounds the elements of X to the nearest integers.
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norm:求矩阵或向量的泛数$ R4 \6 P. x: d! n+ G/ e7 {9 W: o
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x = [1 2 3 4 5 6];
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) ^( V( m0 v) Z5 N, v! t- r8 S, g: i norm(x) = 9.5394% D# Y$ O, h& o8 ]6 H" v( g
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Example:2 I4 G' U1 Z- Y: P, ?
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a= [-0.9, -2.1, -0.4, 0.3, 0.8, 1.1, 2.7, -1.2+2.9i];
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0 F- B0 I& `% R) r5 [floor(a)=[ -1, -3, -1, 0, 0, 1, 2, -2+2i]
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ceil(a)= [ 0, -2, 0, 1, 1, 2, 3, -1+3i]" p; I, r' R0 u- ~. p
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fix(a)= [ 0, -2, 0, 0, 0, 1, 2, -1+2i]% O9 a, ~( T/ [9 a* P" B- |
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round(a)=[-1, -2, 0, 0, 1, 1, 3, -1+3i]0 r( ?! [/ t" R: x& j
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注:For complex X, for all the four fuctions the imaginary and real parts are rounded independently
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