Displaying 3 results from an estimated 3 matches for "postmultipli".
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postmultiply
2003 May 08
2
natural splines
Apologies if this is this too obscure for R-help.
In package splines, ns(x,,knots,intercept=TRUE) produces an n by K+2
matrix N, the values of K+2 basis functions for the natural splines with K
(internal) knots, evaluated at x. It does this by first generating an
n by K+4 matrix B of unconstrained splines, then postmultiplying B by
H, a K+4 by K+2 representation of the nullspace of C (2 by K+4),
2007 Jan 23
3
[fixed] vectorized nested loop: apply a function that takes two rows
(Extremely sorry, disregard previous email as I hit send before pasting the latest version of the example; this one is smaller too)
Dear R users,
I want to apply a function that takes two vectors as input to all pairs
(combinations (nrow(X), 2))of matrix rows in a matrix.
I know that ideally, one should avoid loops in R, but after reading the docs for
do.call, apply, etc, I still don't know
2007 Jan 23
3
[fixed] vectorized nested loop: apply a function that takes two rows
(Extremely sorry, disregard previous email as I hit send before pasting the latest version of the example; this one is smaller too)
Dear R users,
I want to apply a function that takes two vectors as input to all pairs
(combinations (nrow(X), 2))of matrix rows in a matrix.
I know that ideally, one should avoid loops in R, but after reading the docs for
do.call, apply, etc, I still don't know