matlab中的floor什么意思

matlab中的floor什么意思

a(i)等于x对3取余数，
mod的例子如下：

>> mod(3,3)

ans =

0

>> mod(5,3)

ans =

2

>> mod(1,3)

ans =

1

mod的详细解释如下：
>> help mod
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.