[R] apply and cor()
David L Carlson
dcarlson at tamu.edu
Fri May 12 17:47:41 CEST 2017
Actually, r is a vector, not an index value. You need
apply(compare_data, 1, function(r) cor(r, t(test_data)))
-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ismail SEZEN
Sent: Friday, May 12, 2017 10:11 AM
To: Micha Silver <tsvibar at gmail.com>
Cc: R-help at r-project.org
Subject: Re: [R] apply and cor()
> On 12 May 2017, at 17:57, Micha Silver <tsvibar at gmail.com> wrote:
>
> I have two data.frames, one with a single row of 31 columns, and the second with 269 rows and the same 31 columns.
> > dim(compare_data)
> [1] 269 31
> > dim(test_data)
> [1] 1 31
>
> I want to apply cor() between the one row of 'test_data', and each row of the 'compare_data' .
> I tried 'apply' but I get this error:
> > apply(compare_data, 1, function(r) {cor(compare_data[r,], test_data)})
> Error in cor(compare_data[r, ], test_data) : incompatible dimensions
apply(compare_data, 1, function(r) {cor(compare_data[r,], as.numeric(test_data))})
See ?cor. Explanation of y is "NULL (default) or a vector, matrix or data frame with compatible dimensions to x”.
>
>
> In order to try to understand I did:
> > dims <- apply(compare_data, 1, function(r) {dim(compare_data[r,])})
> > head(dims)
> 20 73 103 118 130 142 151 154 191 205 217 222 227 232 240 275 282 301 320 359 360 551 589 653 789 801 808 812
> [1,] 9 8 8 9 5 9 8 11 6 15 12 13 10 7 9 14 8 11 9 11 11 12 9 14 5 8 9 10
> [2,] 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31
> 840 856 857 867 885 970 983 985 1103 1107 1197 1207 1237 1262 1279 1282 1332 1357 1358 1392 1411 1435 1458 1473
> [1,] 14 11 12 8 10 2 7 9 10 8 10 13 11 7 9 12 11 11 16 10 10 12 10 10
> [2,] 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31
>
> and indeed I am getting different row dimensions. I expected "1 31" for each. What are the values 9,8,8,9,5... in the [1,] dimension?
>
> If I test the compare_data data.frame one row at a time:
> > dim(compare_data['20',])
> [1] 1 31
> > dim(compare_data['1473',])
> [1] 1 31
>
> It looks as I expected.
> What am I missing??
>
> Thanks
>
> --
> Micha Silver
> cell: +972-523-665918
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
[[alternative HTML version deleted]]
______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
More information about the R-help
mailing list