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add information about portability of compression #256

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Aug 21, 2015
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add information about portability of compression #256

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5 changes: 3 additions & 2 deletions doc/hdf5.md
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Expand Up @@ -106,8 +106,9 @@ g["A", "chunk", (5,5), "compress", 3] = A
stores the matrix `A` in 5-by-5 chunks and uses a compression level
`3`. Instead of `"compress"`, you can use `"deflate"` to specify
[deflate/zlib](http://en.wikipedia.org/wiki/DEFLATE) compression, or
`"blosc"` to specify [Blosc](http://www.blosc.org/) compress (which is
generally much faster than deflate); currently, `"compress"`
`"blosc"` to specify [Blosc](http://www.blo sc.org/) compress. Blosc is
generally much faster than deflate, however, files with deflate compression are more
portable. Currently, `"compress"`
corresponds to `"blosc"`. Chunking can be useful if you will typically
extract small segments of an array. A heuristic chunking is
automatically used if you specify compression but don't specify
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