Updating a big.matrix filebacking.
For a file-backed
any modified information to be written to the file-backing.
This function flushes any modified data (in RAM) of a file-backed
big.matrix to disk. This may be useful for
improving performance in cases where allowing the operating system to decide
on flushing creates a bottleneck (likely near the threshold of available RAM).
FALSE (invisible), indicating whether or not the flush was successful.
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