FBM.code256-class | R Documentation |
A reference class for storing and accessing up to 256 arbitrary different
values using a Filebacked Big Matrix of type unsigned char
. Compared to a
Filebacked Big Matrix, it adds a slot code
which is used as
a lookup table of size 256.
FBM.code256( nrow, ncol, code = rep(NA_real_, 256), init = NULL, backingfile = tempfile(tmpdir = getOption("FBM.dir")), create_bk = TRUE, is_read_only = FALSE ) add_code256(x, code)
nrow |
Number of rows. |
ncol |
Number of columns. |
code |
A numeric vector (of length 256).
You should construct it with |
init |
Either a single value (e.g. |
backingfile |
Path to the file storing the Big Matrix on disk. An extension ".bk" will be automatically added. Default stores in the temporary directory. |
create_bk |
Whether to create a backingfile (the default) or use an
existing one (which should be named by the |
is_read_only |
Whether the FBM is read-only? Default is |
x |
A FBM. |
X <- FBM(10, 10, type = "raw") X[] <- sample(as.raw(0:3), size = length(X), replace = TRUE) X[] # From an FBM of type 'raw' ('unsigned char') code <- rep(NA_real_, 256) code[1:3] <- c(1, 3, 5) X.code <- add_code256(X, code) X.code[] # Or directly X.code2 <- FBM.code256(10, 10, code, init = sample(as.raw(0:3), 100, TRUE)) X.code2[] # Get a new FBM.code256 object with another code (but same underlying data) X.code3 <- X.code$copy(code = rnorm(256)) all.equal(X.code$code256, code)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.