Hi, I have worked long and hard and looked in the manuals and am having a hard time constructing a diagonal matrix. I can get the diagonals out of a matrix but can't construct the matrix with just the diagonals. I have been on the web site and manuals and I think that it says to use: dsj <- diag (three = 1, nrow, ncol = 7) three is the name of my matrix and dsj is where I'm trying to put it but it comes back: unused argument(s) (three ...) every time that I try it. Am I doing something wrong in trying to make this matrix? Thank you very much for your time, Chris Ryan Christopher W. Ryan Black Bear Project Leader West Virginia Division of Natural Resources Capitol Complex, Bldg 3, Rm 824 Charleston, WV 25305 [[alternative HTML version deleted]]
Chris Ryan <chrisryan <at> wvdnr.gov> writes: : : Hi, : : I have worked long and hard and looked in the manuals and am having a hard time constructing a diagonal : matrix. I can get the diagonals out of a matrix but can't construct the matrix with just the diagonals. I : have been on the web site and manuals and I think that it says to use: : : dsj <- diag (three = 1, nrow, ncol = 7) three is the name of my matrix and dsj is where I'm trying to put it but it : comes back: : : unused argument(s) (three ...) : every time that I try it. : : Am I doing something wrong in trying to make this matrix? : : Thank you very much for your time, Chris Ryan : Looking at ?diag we see that diag takes 3 arguments: 'x', 'nrow' and 'ncol'. 'three' is not one of them so it is correctly telling you that you specified an unused argument. diag(nrow = 7) # will create a 7x7 identity matrix. diag(1, 7) # same using positional rather than named arguments diag(, 7) # same since x defaults to 1 Look at the examples at the bottom of the ?diag page and try them out by running example(diag) at the R prompt or by just typing them in to get more insight. Also you might consider rereading the Introduction to R manual where it is covered on page 22.
Did you try working the examples in the "diag" documentation, one
of which is as follows:
> diag(10,3,4) # guess what?
[,1] [,2] [,3] [,4]
[1,] 10 0 0 0
[2,] 0 10 0 0
[3,] 0 0 10 0
(R 1.9.1 for Windows).
The R syntax expects "three" in that context to be an argument
of
the function "diag". If you want a 7x7 identity matrix, try diag(7).
If you want something else, please study the examples in the
documentation for "diag". If that is not adequate, let us know.
hope this helps. spencer graves
Chris Ryan wrote:
>Hi,
>
>I have worked long and hard and looked in the manuals and am having a hard
time constructing a diagonal matrix. I can get the diagonals out of a matrix
but can't construct the matrix with just the diagonals. I have been on the
web site and manuals and I think that it says to use:
>
>dsj <- diag (three = 1, nrow, ncol = 7) three
is the name of my matrix and dsj is where I'm trying to put it but it comes
back:
>
>unused argument(s) (three ...)
>every time that I try it.
>
>Am I doing something wrong in trying to make this matrix?
>
>Thank you very much for your time, Chris Ryan
>
>
>Christopher W. Ryan
>Black Bear Project Leader
>West Virginia Division of Natural Resources
>Capitol Complex, Bldg 3, Rm 824
>Charleston, WV 25305
>
> [[alternative HTML version deleted]]
>
>______________________________________________
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>
>
--
Spencer Graves, PhD, Senior Development Engineer
O: (408)938-4420; mobile: (408)655-4567