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-boun...@r-project.org] On Behalf Of Ismail SEZEN Sent: Friday, May 12, 2017 10:11 AM To: Micha Silver <tsvi...@gmail.com> Cc: R-help@r-project.org Subject: Re: [R] apply and cor() > On 12 May 2017, at 17:57, Micha Silver <tsvi...@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@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@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. ______________________________________________ R-help@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.
