[R] How to name matrices from a list with lapply ?

Dear list, I have a list of matrices : i1 - matrix(1:10, nrow = 2, ncol = 5) i2 - matrix(11:20, nrow = 2, ncol = 5) j - list(i1 = i1, i2 = i2) I would like to attribute names to each dimension, for each matrix, as follows : $i1 B1 B2 B3 B4 B5 A1 1 3 5 7 9 A2 2 4 6 8 10 $i2 B1 B2 B3 B4 B5 A1

[R] List of lists ?

Dear list, I have to use a list of lists containing vectors. For instance : [[1]] [[1]][[1]] [1] 1 2 3 [[1]][[2]] [1] 3 2 1 I want to attribute vectors to the main list without use of an intermediate list, but it does not work : x - list() x[[1]][[1]] - c(1, 2, 3) x[[1]][[2]] - c(3, 2, 1)

[R] Fwd: List of lists ?

-- Forwarded message -- From: Carlos Petti carlos.pe...@gmail.com Date: 2010/8/10 Subject: Re: [R] List of lists ? To: David Winsemius dwinsem...@comcast.net Thanks for answer. I read the error messages but I did not find the solution :-( Your solution works. But, a new problem

[R] Fwd: List of lists ?

-- Forwarded message -- From: Carlos Petti carlos.pe...@gmail.com Date: 2010/8/10 Subject: Re: [R] List of lists ? To: David Winsemius dwinsem...@comcast.net Perhaps a solution : x - list() x[[2]] - list() x[[2]][[1]] - c(1, 2, 3) x[[2]][[2]] - c(3, 2, 1) 2010/8/10 Carlos

[R] How to invert a list ?

Dear list, I have a list, as follows : a - 5 names(a) - a b - 9 names(b) - b c - 15 names(c) - c x - list(i = a, j = b, j = c) I want to invert the list, like this : $a i 5 $b j k 9 15 I do not find a clean solution. Could anyone give me elegant ideas ? Thanks in advance, Carlos

Re: [R] How to invert a list ?

() y$a - a y$b - c(b,c) names(y$a) - i names(y$b) - c(j,k) Carlos Petti wrote: a - 5 names(a) - a b - 9 names(b) - b c - 15 names(c) - c x - list(i = a, j = b, j = c) - A R learner. -- View this message in context: http://r.789695.n4.nabble.com/How-to-invert-a-list

Re: [R] How to invert a list ?

A beginning of solution... n - sapply(x, function(i) names(i)) tapply(x, n, c) 2010/8/11 Carlos Petti carlos.pe...@gmail.com: Thanks. On the other hand, I try to obtain the same result but from this list : x - list() x$i - 5 x$j - 9 x$k - 15 names(x$i) - a names(x$j) - b names(x$k

Re: [R] How to invert a list ?

Or rather : n - sapply(x, function(i) names(i)) tapply(x, n, names) 2010/8/11 Carlos Petti carlos.pe...@gmail.com: A beginning of solution... n - sapply(x, function(i) names(i)) tapply(x, n, c) 2010/8/11 Carlos Petti carlos.pe...@gmail.com: Thanks. On the other hand, I try to obtain

Re: [R] How to invert a list ?

) - c(NameA,NameB) Regards, Wu From: Carlos Petti [carlos.pe...@gmail.com] Sent: Wednesday, August 11, 2010 5:39 AM To: Wu Gong Cc: r-help@r-project.org Subject: Re: [R] How to invert a list ? Or rather : n - sapply(x, function(i) names(i

[R] How to match vector with a list ?

Dear list, I have a vector of characters and a list of two named elements : i - c(a,a,b,b,b,c,c,d) j - list(j1 = c(a,c), j2 = c(b,d)) I'm looking for a fast way to obtain a vector with names, as follows : [1] j1 j1 j2 j2 j2 j1 j1 j2 I used : match - lapply(j, function (x) {which(i %in% x)})

Re: [R] How to match vector with a list ?

)) user system elapsed 0.084 0.004 0.088 2010/3/5 William Dunlap wdun...@tibco.com -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Carlos Petti Sent: Friday, March 05, 2010 9:43 AM To: r-help@r-project.org Subject: [R] How

[R] How to sum a list of matrices ?

Dear list, I have a list of three matrices : i = list(matrix(1:4,2,2), matrix(3:6,2,2), matrix(9:12,2,2)) I would like to sum the matrices, as follows : [,1] [,2] [1,] 13 19 [2,] 16 22 I used this code : k - i[[1]] for (j in (2:length(i))) { k - k + i[[j]]} But, is it possible to sum

[R] Transform contingency table into data.frame ?

Dear list, I have a contingency table : a - letters[1:3] t - table(a) I'm looking for a way to transform this table into data frame, as follows : Freq a1 b1 c1 I used : df - as.data.frame(t, row.names = names(t)) But, this function do not remove the duplicated column. Do you

Re: [R] Transform contingency table into data.frame ?

Dear list, Sorry, I did not explain myself very well. I want to obtain a data.frame like this : Freq a1 b1 c1 This data.frame contains just one column (Freq) and each row is named. But when I use this code : df - as.data.frame(t) or this code : df - as.data.frame(t,

Re: [R] Transform contingency table into data.frame ?

Dear list, Thank you for your answers. Petr, your solution works great :-) Peter's solution too. Carlos 2010/3/17 Ivan Calandra ivan.calan...@uni-hamburg.de Now I get it, I was still thinking you wanted two columns. I was confused by the print example. Petr's suggestion works well then