On May 31, 2012, at 7:37 AM, <nata...@orchidpharma.com> <nata...@orchidpharma.com
> wrote:
Dear R-list members,
I have a matrix with non-numeric variables in it and I have to
optimize the variables of the matrix in a formula using optim
routine of the stats4 package. I know the matrix can only take
numeric data
Some of the things you think you know, are not so:
> exvec <- c('0.05V1+V2', '0.31V1', '0.05V1', '0.31V1', '0.3V1+V2',
'0.5V1', '0.05V1', '0.5V1', '0.1V1+V2')
> matrix(exvec, 3,3)
[,1] [,2] [,3]
[1,] "0.05V1+V2" "0.31V1" "0.05V1"
[2,] "0.31V1" "0.3V1+V2" "0.5V1"
[3,] "0.05V1" "0.5V1" "0.1V1+V2"
and so I would like to know how to store non-numeric variables
inside a matrix.
Say for example: The 3X3 matrix is 0.05V1+V2 0.31V1
0.05V1
0.31V1 0.3V1+V2
0.5V1 0.05V1
0.5V1 0.1V1+V2
The matrix is only for an example and the real matrix that I want to
use is a 15X15 matrix ,here I would like to optimize the values of
V1 and V2 using a formula.
Whether that plan makes sense seems problematic, but that wasn't your
question.
Could you please help me how to go about to represent the matrix in R.
I'm guessing you have thoughts of evaluating these expressions. They
are not valid R expressions, however. You have some further study to do.
--
David Winsemius, MD
West Hartford, CT
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