What strategy for random accession of records in massive FASTA file?
mike at maibaum.org
Fri Jan 14 11:02:11 CET 2005
On Thu, Jan 13, 2005 at 04:41:45PM -0800, Robert Kern wrote:
>Jeff Shannon wrote:
>>(Plus, if this format might be used for RNA sequences as well as DNA
>>sequences, you've got at least a fifth base to represent, which means
>>you need at least three bits per base, which means only two bases per
>>byte (or else base-encodings split across byte-boundaries).... That gets
>>ugly real fast.)
>Not to mention all the IUPAC symbols for incompletely specified bases
>(e.g. R = A or G).
Or, for those of us working with proteins as well, all the single letter codes for proteins:
lots more bits.
I have a db with approx 3 million proteins in it and would not want to be using a pure python approach :)
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