I got sorted,

Thanks all


On Fri, Oct 4, 2013 at 2:03 PM, S Ellison <S.Ellison@lgcgroup.com> wrote:

> > I have a set of data and I need to find out how many points are below a
> > certain value but R will not calculate this properly for me.
> R will. But you aren't.
>
> > Negative numbers seem to be causing the issue.
> You haven't got any negative numbers in your data set. In fact, you
> haven't got any numbers. It's all character strings. Is there a reason for
> that?
>
> Assuming there is, if you have your data in a data frame 'A' and just want
> the count:
>
> table(as.numeric(A$Tm_ugL) <= 0.0002)
>
> If you just want a complete vector of TRUE or FALSE
> as.numeric(d$Tm_ugL) <= 0.0002)
>
> does that. If you want to add that to your data frame (is it called A?)
> that looks like
> A$Censored <- as.numeric(d$Tm_ugL) <= 0.0002)
>
> But you really shouldn't have numbers in character format; read it as
> numeric. Then it's just
> table(d$Tm_ugL <= 0.0002) and so on. If it's refusing to read as numeric,
> find out why and fix the data.
>
>
> And some comments on code, while I'm here:
>
> > for (i in one:nrow(A))
> ...
> >   if (A[i,two]<=A_LLD)
> Variables called 'one' and 'two' look like a really bad idea. If they are
> equal to 1 and 2, use 1 and 2 (or 1L and 2L if you want to be _sure_ they
> are integer). If not, the names are going to be pretty confusing, no?
>
> >     (A_Censored[i,two]<-"TRUE")
> Why use a character string like "TRUE" that R can't interpret as logical
> instead of the logical values TRUE and FALSE?
>
> S Ellison
>
>
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