diffrence between rem and mod
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mod(4,-10)
ans =
-6
>> rem(4,-10)
ans =
4
guys could you tell me in simple language whats is diffrence between two huh i know mod take the second number symbol but i didnt get the real math out of it
采纳的回答
Star Strider
2015-5-29
0 个投票
2 个评论
hanish h
2015-5-29
Star Strider
2015-5-29
The difference is between the fix function (that rounds toward 0) and the floor function (that rounds toward -Inf).
For 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.
%
% See also REM.
% Copyright 1984-2005 The MathWorks, Inc.
% Built-in function.
For rem:
%REM Remainder after division.
% REM(x,y) is x - n.*y where n = fix(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.
%
% By convention:
% REM(x,0) is NaN.
% REM(x,x), for x~=0, is 0.
% REM(x,y), for x~=y and y~=0, has the same sign as x.
%
% Note: MOD(x,y), for x~=y and y~=0, has the same sign as y.
% REM(x,y) and MOD(x,y) are equal if x and y have the same sign, but
% differ by y if x and y have different signs.
%
% See also MOD.
% Copyright 1984-2005 The MathWorks, Inc.
% Built-in function.
更多回答（1 个）
Samiu Haque
2020-9-7
0 个投票
When mod(4,-10) is used, it works as -10*1=-10 and the remainder becomes 4-10=-6
But when rem(4,-10) is used, it works as -10*0=0 and the remainder becomes 4-0=4
If the dividend and divisor both are positive integers, then rem() and mod() function returns the same result. But if either of them is negative, then mod() function avoid the multiple of zero and return the remainder considering the quotient as 1. This is because the mod() function's output is periodic.
2 个评论
Moon Light
2022-1-8
mod(4,-3) ans= - 2
Why??
Walter Roberson
2022-1-9
(-3*-2) + (- 2) = 4 (-3*-1) + ( 1) = 4
However, when you use mod() and the remainder is not 0 then it will be the same sign as the modulus (second parameter)
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