Re: [R] Selecting all values smaller than X in a dataframe

From: Vladimir Eremeev <wl2776_at_gmail.com>
Date: Mon, 11 Jun 2007 05:35:38 -0700 (PDT)

Christoph Scherber-2 wrote:
>
> Dear R users,
>
> I have a correlation matrix for a dataframe called "synth", for which I
> now want to select only those cells that have correlations larger than
> +/-0.6:
>
> synth=data.frame(x=rnorm(10,1),y=rnorm(10,2),z=rnorm(10,0.5))
>
> w=cor(synth,use="pairwise.complete.obs")
> w=as.data.frame(w)
> w[,sapply(w,abs(w),">",0.6)]
>
> The problem is that using sapply with ">" or "<" doesn´t seem to work.
>
> How could I solve this problem?
>
>

If you want to extract correlations with absolute value >0.6, then simply use w[abs(w)>0.6]

Please, reread the help("sapply"). You give some extra arguments to this function.
The first goes the vector, the second goes the function, and then - additional arguments to the function.
Probably, you wanted w[sapply(abs(w),">",0.6)] This gives the same result.

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Received on Mon 11 Jun 2007 - 12:43:25 GMT

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