Re: [R] question about matrix
outer(0:2, 1:2, "^") [,1] [,2] [1,]00 [2,]11 [3,]24 Is this what you want? spencer graves Cynthia He wrote: Hello there, How to write this matrix in R? The "^" sign is a power symbol. Thanks a lot! 0^1 0^2 . 0^n 1^1 1^2 . 1^n 2^1 2^2 . 2^n q^1 q^2 . q^n - [[alternative HTML version deleted]] __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] question about matrix
Cynthia He <[EMAIL PROTECTED]> writes: > How to write this matrix in R? The "^" sign is a power symbol. > > Thanks a lot! > > > 0^1 0^2 . 0^n > 1^1 1^2 . 1^n > 2^1 2^2 . 2^n > > > q^1 q^2 . q^n Use the outer product function, as in > outer(0:5, 1:4, "^") [,1] [,2] [,3] [,4] [1,]0000 [2,]1111 [3,]248 16 [4,]39 27 81 [5,]4 16 64 256 [6,]5 25 125 625 __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
[R] question about matrix
Hello there, How to write this matrix in R? The "^" sign is a power symbol. Thanks a lot! 0^1 0^2 . 0^n 1^1 1^2 . 1^n 2^1 2^2 . 2^n q^1 q^2 . q^n - [[alternative HTML version deleted]] __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
RE: [R] question about matrix
You could consider storing your data in 3d array. If A and B are your matrices of first and second numbers, respectively, with both being of the same shape, then: C <- array(c(A,B), dim=c(dim(A),2)) gives you a 3d array. For example, C[,,1] is A C[,,2] is B C[2,1,] is the the vector: c(A[2,1],B[2,1]) --- Date: Wed, 12 Nov 2003 11:41:17 -0600 (CST) From: Mikyoung Jun <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Subject: [R] question about matrix Hello, I have a few questions about matrix in R. Can we make a matrix whose elements are list? I would like to save two different values in each elements of matrix. If there is a package or something which can deal with complex numbers, that will do it too. Also, I am wondering whether there is a function to calculate the rank of the matrix. I found a matrix package, but it doesn't have functions like that. Thanks a lot in advance! Mikyoung Jun __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
Re: [R] question about matrix
Mikyoung -
All answers are "yes", but IMHO you are trying to be
too clever with your data structure. Programming is
*much* easier if you keep things simple.
Specifically:
(1) The function matrix() will happily build you
a matrix of type "list", with each element of the list
occupying one cell in the matrix. For example,
tma <- matrix(as.list(letters), nrow=13, ncol=2)
is.list(tma)
[1] TRUE
is.matrix(tma)
[1] TRUE
tma[5,2]
[[1]]
[1] "r"
Same effect with
tma <- as.list(letters)
dim(tma) <- c(13,2)
(2) Complex numbers - see help("complex"). This
help page even gives an example which constructs a
matrix of complex numbers.
(3) To find the rank of matrix x, qr(x)$rank.
I don't think there is a specific extractor function
for this component, but I could be wrong.
(4) But, once again, I think you would be better served by
storing your two values of different types either as two
separate matrices, or as two columns in a data frame, with
additional columns of repetitive integers to indicate the
row and column in your conceptual matrix.
See help("tapply"), help("aggregate") for two functions
which can operate on such a data structure, and help("gl")
help("col"), help("row") for functions that will generate
the additional columns.
HTH - tom blackwell - u michigan medical school - ann arbor -
On Wed, 12 Nov 2003, Mikyoung Jun wrote:
> Hello,
>
> I have a few questions about matrix in R.
>
> Can we make a matrix whose elements are list? I would like to save two
> different values in each elements of matrix. If there is a package or
> something which can deal with complex numbers, that will do it too. Also,
> I am wondering whether there is a function to calculate the rank of the
> matrix. I found a matrix package, but it doesn't have functions like that.
>
> Thanks a lot in advance!
>
> Mikyoung Jun
>
> __
> [EMAIL PROTECTED] mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>
__
[EMAIL PROTECTED] mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
[R] question about matrix
Hello, I have a few questions about matrix in R. Can we make a matrix whose elements are list? I would like to save two different values in each elements of matrix. If there is a package or something which can deal with complex numbers, that will do it too. Also, I am wondering whether there is a function to calculate the rank of the matrix. I found a matrix package, but it doesn't have functions like that. Thanks a lot in advance! Mikyoung Jun __ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
