[R] count appearence of zero in a vector

[Suzen, Mehmet]

I am always reserved about types and not sure how R auto casting works
internally.
In a large code using many different packages, I think being reserved about
this would not hurt.

Also, are there anyway to force R to be "strongly typed" similar to
Occaml etc...

mem


On 4 January 2013 16:35, arun <smartpink111 at yahoo.com> wrote:
>
> As long as there are no negative numbers, method2 and 3 works:
>  test[1]<- -1
> length(which(test==0))
> #[1] 6
>  length(which(test<1))
> #[1] 7
>  length(which(test < .Machine$double.xmin))
> #[1] 7
>
> length(which(abs(test)<1))
> #[1] 6
>  length(which(abs(test) < .Machine$double.xmin))
> #[1] 6
> A.K.
>
>
>
>
> ----- Original Message -----
> From: "Suzen, Mehmet" <msuzen at gmail.com>
> To: Hermann Norpois <hnorpois at googlemail.com>
> Cc: R help <r-help at r-project.org>
> Sent: Friday, January 4, 2013 12:27 AM
> Subject: Re: [R] count appearence of zero in a vector
>
> Hi Hermann,
>
> You may want to use ?which, to store the index as well (might be handy
> in debugging or some other
> purposes if zeros has some special meaning) :
>
> test <- c(1, 1, 1 , 1 , 1, 1, 2, 1, 1, 1, 0, 2, 0, 1, 1, 0, 0, 0, 1,
> 1, 1, 0, 1, 2, 1, 1, 1, 1, 1, 1)
> length(which(test==0))
>
> But be careful when using == 0. If you are sure that elements are all
> integers I prefer this
>
> length(which(test <1)).
>
> Or a safe tolerance value from .Machine, if you are dealing with double numbers.
>
> length(which(test < .Machine$double.xmin))
>
>
> -m
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>