Description Usage Arguments Details Value
This is used to take the transpose of a big.matrix, with the new copy optionally filebacked
1 2 3 |
x |
A |
cols |
Possible subset of columns for the transpose; could be numeric, named, or logical |
rows |
Possible subset of rows for the transpose; could be numeric, named, or logical |
y |
Optional destinitation object (matrix or big.matrix); if not specified, a big.matrix will be created |
type |
preferably specified (e.g. "integer", "double", etc.) |
separated |
use separated column organization of the data instead of column-major organization; use with caution if the number of columns is large. |
backingfile |
the root name for the file(s) for the cache of x. |
backingpath |
the path to the directory containing the file backing cache |
descriptorfile |
the name of the file to hold the backingfile description, for subsequent use with
|
binarydescriptor |
the flag to specify if the binary RDS format should be used for the backingfile description,
for subsequent use with |
shared |
TRUE by default, and always TRUE if the big.matrix is file-backed. For a non-filebacked big.matrix, shared=FALSE uses non-shared memory, which can be more stable for large (say, >50 allocation can sometimes fail in such cases due to exhausted shared-memory resources in the system. |
This is need to make a tranpose of a "big.matrix"
because R syntax won't access beyond the pointer.
Converting between normal 'matrix' and 'big.matrix' also is expensive to use the normal "t"
function. This
also allows the user to optionally fileback the transposed object if it will be accessed several times.
a transposed "big.matrix"
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