[求助]rem和mod有什么区别，谢谢各位大虾

痒痒挠 · 发表于 2006-6-4 16:32

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谢谢谢谢 我知道二者有区别，但是到底区别在哪却不大清楚。 哪位大虾可以给小弟解释一下，感激不尽

[此贴子已经被cdwxg于2006-6-4 17:18:18编辑过]

cdwxg · 发表于 2006-6-4 17:17

R = rem(X,Y) if Y ~= 0, returns X - n.*Y where n = fix(X./Y). If Y is not an integer and the quotient X./Y is within roundoff error of an integer, then n is that integer. By convention, rem(X,0) is NaN. The inputs X and Y must be real arrays of the same size, or real scalars M = mod(X,Y) if Y ~= 0, returns X - n.*Y where n = floor(X./Y) . If Y is not an integer and the quotient X./Y is within roundoff error of an integer, then n is that integer. By convention, mod(X,0) is X. The inputs X and Y must be real arrays of the same size, or real scalars So long as operands X and Y are of the same sign, the statement rem(X,Y) returns the same result as does mod(X,Y). However, for positive X and Y, rem(-X,Y) = mod(-X,Y)-Y 也就是说除了特定的几个用途外，只有正负时候的转化有区别。 
The rem function returns a result that is between 0 and sign(X)*abs(Y). If Y is zero, rem returns NaN. The mod function is useful for congruence relationships: x and y are congruent (mod m) if and only if mod(x,m) == mod(y,m). 对于平常用的常数类或者常数矩阵基本没有区别。

[此贴子已经被作者于2006-6-4 17:26:02编辑过]

痒痒挠 · 发表于 2006-6-4 17:55

谢谢哈

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