MATLAB中的取整函数（fix、round、floor、ceil）

• fix - 向零方向取整

fix Round towards zero.
    fix(X) rounds the elements of X to the nearest integers towards zero.

例：

t =

7.6806 3.5388 3.6130
2.3309 3.4719 7.4163
5.8736 2.5372 7.0590

fix(t)

ans =

7 3 3
2 3 7
5 2 7

• round - 向最近的方向取整，亦即“四舍五入”

round rounds towards nearest decimal or integer
    round(X) rounds each element of X to the nearest integer.

例：

t =

7.6806 3.5388 3.6130
2.3309 3.4719 7.4163
5.8736 2.5372 7.0590

round(t)

ans =

8 4 4
2 3 7
6 3 7

• 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.

例：

t =

7.6806 3.5388 3.6130
2.3309 3.4719 7.4163
5.8736 2.5372 7.0590

floor(t)

ans =

7 3 3
2 3 7
5 2 7

• 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.

t =

7.6806 3.5388 3.6130
2.3309 3.4719 7.4163
5.8736 2.5372 7.0590

ceil(t)

ans =

8 4 4
3 4 8
6 3 8