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关于floor函数的作用：
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0 d# d' d9 Q5 F7 M8 G& Ffloor：朝负无穷方向舍入
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B = floor(A) rounds the elements of A to the nearest integers less than or equal to A.
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/ ], W( Q5 P1 p2 j2 F: @8 uceil：朝正无穷方向舍入1 g- \: j3 w1 ]/ J1 n! \
7 F8 k' j6 K& h8 pB = ceil(A) rounds the elements of A to the nearest integers greater than or equal to A.
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fix：朝零方向舍入/ L3 U) h6 p- q, K' k6 ?- D
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B = fix(A) rounds the elements of A toward zero, resulting in an array of integers.
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; |4 w0 j; ^" K; T7 Q5 Qround：四舍五入
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B = round(A) rounds the elements of X to the nearest integers. 3 A6 g& B" k2 L) ]+ s" F4 g
m' F) L& y& n( [norm：求矩阵或向量的泛数& w) b% u& q5 V: e9 J
' [2 C) j7 L; ~0 ]" ~- I2 S x = [1 2 3 4 5 6];
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' Z7 A4 X6 e, O9 @ norm(x) = 9.53946 u q! A4 k) L- M7 X
. \% x4 E# _1 UExample：" } Q' o# @) D y; I# V
1 `. R* p, u- E4 F" ba= [-0.9, -2.1, -0.4, 0.3, 0.8, 1.1, 2.7, -1.2+2.9i];8 e5 u* o6 q7 J$ O; }: ^
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floor(a)=[ -1, -3, -1, 0, 0, 1, 2, -2+2i]
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9 c: U" x$ U: o% oceil(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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round(a)=[-1, -2, 0, 0, 1, 1, 3, -1+3i]
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# d ]# V; v' j1 N! ]5 j# Y注：For complex X, for all the four fuctions the imaginary and real parts are rounded independently
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发表于 2020-7-7 18:55
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