matlab里面的取整函数（fix，round，floor……

1、fix-向零方向取整。

fix    Round towards zero.

    fix(X) rounds the elements of X to the nearest integers

    towards zero.

2、fix使用举例：

t =

    7.6806    3.5388    3.6130    9.0150    8.1769    3.1781

    2.3309    3.4719    7.4163    3.1834    9.8118    9.8445

    5.8736    2.5372    7.0590    5.9708    8.6199    5.4825

    4.5897    9.5253    7.0089    2.9780    0.8382    7.4925

    8.6098    2.9820    0.0623    1.2501    3.3771    8.4185

    6.6084    1.5841    3.7435    3.8836    2.3613    1.6689

-----------------------------------------------------------------------

 fix(t)

ans =

     7     3     3     9     8     3

     2     3     7     3     9     9

     5     2     7     5     8     5

     4     9     7     2     0     7

     8     2     0     1     3     8

     6     1     3     3     2     1

3、round-向最近的方向取整。

round  Round towards nearest integer.

    round(X) rounds the elements of X to the nearest integers.

4、floor-向负无穷大方向取整：

 floor  Round towards minus infinity.

    floor(X) rounds the elements of X to the nearest integers

    towards minus infinity.

5、ceil-向正无穷大方向取整。

 ceil   Round towards plus infinity.

    ceil(X) rounds the elements of X to the nearest integers

    towards infinity.

6、mod-计算模数：

 mod    Modulus after division.

    mod(x,y) is x - n.*y where n = floor(x./y) if y ~= 0.  If y is not an

    integer and the quotient x./y is within roundoff error of an integer,

    then n is that integer.  The inputs x and y must be real arrays of the

    same size, or real scalars.

    The statement "x and y are congruent mod m" means mod(x,m) == mod(y,m).

    By convention:

       mod(x,0) is x.

       mod(x,x) is 0.

       mod(x,y), for x~=y and y~=0, has the same sign as y.

    Note: REM(x,y), for x~=y and y~=0, has the same sign as x.

    mod(x,y) and REM(x,y) are equal if x and y have the same sign, but

    differ by y if x and y have different signs.