apply,big.matrix-method {biganalytics} | R Documentation |
apply for big.matrix
objects.
Note that the performance may be degraded (compared to apply
with
regular R matrices) because of S4 overhead associated with extracting data
from big.matrix
objects. This sort of limitation is unavoidable and
would be the case (or even worse) with other "custom" data structures. Of
course, this would only be partically significant if you are applying over
lengthy rows or columns.
## S4 method for signature 'big.matrix'
apply(X, MARGIN, FUN, ..., simplify)
X |
a big.matrix object. |
MARGIN |
the margin. May be may only be 1 or 2, but otherwise
conforming to what you would expect from |
FUN |
the function to apply. |
... |
other parameters to pass to the FUN parameter. |
simplify |
see the base::apply documentation. |
library(bigmemory)
options(bigmemory.typecast.warning=FALSE)
x <- big.matrix(5, 2, type="integer", init=0,
dimnames=list(NULL, c("alpha", "beta")))
x[,] <- round(rnorm(10))
biganalytics::apply(x, 1, mean)