Virtual transpose
The vt generic does a matrix or array transpose by modifying virtual attributes
rather than by physically copying matrix elements.
vt(x, ...) ## S3 method for class 'ff' vt(x, ...) ## Default S3 method: vt(x, ...) ## S3 method for class 'ff' t(x)
x |
an ff or ram object |
... |
further arguments (not used) |
The vt.ff method does transpose through reversing dim.ff and dimorder.
The vt.default method is a wrapper to the standard transpose t.
The t.ff method creates a transposed clone.
If x has a virtual window vw defined, vt.ff returns an ff object with a transposed virtual window,
the t.ff method return a transposed clone of the virtual window content only.
an object that behaves like a transposed matrix
Jens Oehlschlägel
x <- ff(1:20, dim=c(4,5)) x vt(x) y <- t(x) y vw(x) <- cbind(c(1,3,0),c(1,4,0)) x vt(x) y <- t(x) y rm(x,y); gc()
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