[R] remove data frame from list of data frames

[jim holtman]

Is this what you are asking; this accepts any dataframe that has at
least one Acc = 1; changing 'any' to 'all' means all Acc==1.  Play
around and get what you need:

> ls<- list(a,b)
> ls
[[1]]
            x         y Acc
1  0.26550866 0.2059746   1
2  0.37212390 0.1765568   1
3  0.57285336 0.6870228   1
4  0.90820779 0.3841037   1
5  0.20168193 0.7698414   1
6  0.89838968 0.4976992   1
7  0.94467527 0.7176185   1
8  0.66079779 0.9919061   1
9  0.62911404 0.3800352   1
10 0.06178627 0.7774452   1

[[2]]
            x         y Acc
1  0.93470523 0.4820801   0
2  0.21214252 0.5995658   0
3  0.65167377 0.4935413   0
4  0.12555510 0.1862176   0
5  0.26722067 0.8273733   0
6  0.38611409 0.6684667   0
7  0.01339033 0.7942399   0
8  0.38238796 0.1079436   0
9  0.86969085 0.7237109   0
10 0.34034900 0.4112744   0

> sapply(ls, function(x) any(x$Acc == 1))
[1]  TRUE FALSE
> ls[sapply(ls, function(x) any(x$Acc == 1))]
[[1]]
            x         y Acc
1  0.26550866 0.2059746   1
2  0.37212390 0.1765568   1
3  0.57285336 0.6870228   1
4  0.90820779 0.3841037   1
5  0.20168193 0.7698414   1
6  0.89838968 0.4976992   1
7  0.94467527 0.7176185   1
8  0.66079779 0.9919061   1
9  0.62911404 0.3800352   1
10 0.06178627 0.7774452   1

>

On Sun, Nov 7, 2010 at 6:07 AM, Matthew Finkbeiner
<matthew.finkbeiner at mq.edu.au> wrote:
> I have a list of data frames like this:
>
> a<- data.frame(x=runif(10), y = runif(10), Acc = 1)
> b<- data.frame(x=runif(10), y = runif(10), Acc = 0)
> ls<- list(a,b)
>
> and I want to remove the data frames from ls that have Acc values other than 1.
>
> How do I do that?
>
> Thanks for any help!
>
> Matthew
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?