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 ff
vt(x, ...)
# S3 method for default
vt(x, ...)
# S3 method for ff
t(x)an object that behaves like a transposed matrix
an ff or ram object
further arguments (not used)
Jens Oehlschlägel
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.
dim.ff, vw, virtual
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()
Run the code above in your browser using DataLab