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Hello, I was wondering if anyone can think of a straightforward way (without loops) to do the following shuffling: Let's imagine a vector: c(1,1,1,2,2,3,3,3) I would like to derive shuffled vectors __where the same digits are never separated__, although they can be at both ends (periodicity). So the following shuffled vectors are possible: c(2,2,1,1,1,3,3,3) c(2,1,1,1,3,3,3,2) c(3,3,3,1,1,1,2,2) c(3,1,1,1,2,2,3,3) etc ... I should mention that there can be any number of different numbers, and any...

...e > || version of Windows). One place in R where the difference might be > || seen is in division by zero: ?1/x? is ?Inf? or ?-Inf? depending on > || the sign of zero ?x?. Another place is ?identical(0, -0, num.eq = > || FALSE)?. > > says the *contrary* ( __Where possible R treats them as the same__ ): > We do _not_ want to distinguish -0 and +0, > but there are cases where it is inavoidable > > And there are good reasons (mathematics !!) for this. > > I'm pretty sure that it would be quite a mistake to start > differentiating it he...

Hi all, The documentation for head() and tail() describes the behavior of these generic functions when n is strictly positive (n > 0) and strictly negative (n < 0). How these functions work when given a zero value is not defined. Both GNU command-line utilities head and tail behave differently with +0 and -0: http://man7.org/linux/man-pages/man1/head.1.html

...does so or not depends on the || version of Windows). One place in R where the difference might be || seen is in division by zero: ?1/x? is ?Inf? or ?-Inf? depending on || the sign of zero ?x?. Another place is ?identical(0, -0, num.eq = || FALSE)?. says the *contrary* ( __Where possible R treats them as the same__ ): We do _not_ want to distinguish -0 and +0, but there are cases where it is inavoidable And there are good reasons (mathematics !!) for this. I'm pretty sure that it would be quite a mistake to start differentiating it here... but of course we can conti...

...ion of Windows). One place in R where the difference might be >> || seen is in division by zero: ?1/x? is ?Inf? or ?-Inf? depending on >> || the sign of zero ?x?. Another place is ?identical(0, -0, num.eq = >> || FALSE)?. >> >> says the *contrary* ( __Where possible R treats them as the same__ ): >> We do _not_ want to distinguish -0 and +0, >> but there are cases where it is inavoidable >> >> And there are good reasons (mathematics !!) for this. >> >> I'm pretty sure that it would be quite a mistake to start &g...