Displaying 2 results from an estimated 2 matches for "pontarelli".
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fonzarelli
2006 Feb 17
3
Matrix indexing in a loop
How do you specify matrix location a[i,j] (or a[i-1,j], etc.) in a "for"
loop?
I am looking for a flexible method of indexing neighbors over a series
of lags (1,2,3...) and I may wish to extend this method to 3D arrays.
Example:
Data matrix
> fun
[,1] [,2] [,3]
[1,] 1 5 9
[2,] 2 6 10
[3,] 3 7 11
[4,] 4 8 12
For each element a[i,j] in
2006 Feb 02
0
Computing s^2 for non-negative least squares.
I know this isn't 100% an R question, but... I have successfully used optim to compute a non-negative regression and would like to compute standard errors for the non-negative coefficients. How do I do this? Also, are there any references where I can read up on the theory. Thanks.
--Brett
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