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关于floor函数的作用：: f/ T( B: v* N5 ~' @! f
8 e8 |+ `- d' J9 [+ efloor：朝负无穷方向舍入# }: K: }0 v) H. Q* i
3 Q) R9 L' _/ Z: D! HB = floor(A) rounds the elements of A to the nearest integers less than or equal to A., I( J& H1 [; L% g+ x4 ~0 Y
4 M7 q% [! _9 [! _: [ceil：朝正无穷方向舍入6 g) d; y+ ^5 R/ ]! W
9 C* m) c! ~- m5 \) JB = 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/ t6 p# S; }$ I
2 ~, w9 z5 {: o- i& p# E3 {B = fix(A) rounds the elements of A toward zero, resulting in an array of integers.
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) I3 V- U" ]* Y$ k% }round：四舍五入
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! [0 L& n# G% U1 I) `3 K0 FB = round(A) rounds the elements of X to the nearest integers. 1 O5 x9 E% Z& }4 }' }9 J% d
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norm：求矩阵或向量的泛数% ?4 ~- i X# m; m5 A9 ]
2 @2 v5 C+ ?6 h, Y x = [1 2 3 4 5 6];
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9 J7 E0 L+ F2 a' x1 a. P norm(x) = 9.5394* J: C5 V1 p; t1 c) ^+ @
& U; A7 R8 V9 D0 i1 f' @# V$ p4 jExample：: ^( {4 F7 \3 K, f. R, Q- T
$ d8 N4 ~# U d$ ]/ ua= [-0.9, -2.1, -0.4, 0.3, 0.8, 1.1, 2.7, -1.2+2.9i];- B$ O5 e2 o8 F
2 T: k3 l6 e$ \) C* T. ~" c3 w b, Ffloor(a)=[ -1, -3, -1, 0, 0, 1, 2, -2+2i]
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% T8 ^) a4 M% C; A0 d; u. hceil(a)= [ 0, -2, 0, 1, 1, 2, 3, -1+3i]
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L" U& A7 Q- ]3 jfix(a)= [ 0, -2, 0, 0, 0, 1, 2, -1+2i]( F2 b- ~) z, g4 v; w; |% v
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round(a)=[-1, -2, 0, 0, 1, 1, 3, -1+3i]
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' y/ B1 `, [, H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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