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Documentation request: allocation of bigarrays in C
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sayan@c...
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Dmitry Bely
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Li-Thiao-Té_Sébastien
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Jonathan Roewen
- Li-Thiao-Té_Sébastien
- Dmitry Bely
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Jonathan Roewen
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Li-Thiao-Té_Sébastien
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Dmitry Bely
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Date: | 2006-04-01 (14:42) |
From: | Li-Thiao-Té_Sébastien <sayan@c...> |
Subject: | Re: [Caml-list] Documentation request: allocation of bigarrays in C |
Jonathan Roewen wrote: >>In my case, I want to read a relatively big file (50MB) containing >>arrays of floats . I use C functions for the raw speed then pass the >>bigarrays to OCaml to do some reordering of the data, and higher-level >>processing. >> >>I do not open the file in Ocaml then send a string to C for parsing, but >>rather open the file in C and return the bigarray list to Ocaml. (cf my >>previous mistake on creating Ocaml lists in C on this mailing-list) > > Does Bigarray.X.map_file not serve the purpose? > Not really. If I am not mistaken, map_file reads a file into a bigarray in binary mode. The file format is not as straightforward as that, I need to parse strings into floats and output a list of bigarrays embedded in a record with additional info. See the following excerpt : 1796.6221 3 1797.4133 250143 1798.0955 2401147 1799.1106 483314 1799.8252 192082 SPEC#: 2 SIZE: 140 TIME: 16.300000 MSLEVEL: 2 PRECURSOR: 531.552002 156.1387 7265 158.9650 1234 161.0317 2536 162.7167 5898 164.6776 12305 165.7509 4636 166.8494 64993 168.6152 35544 169.3650 1798 FYI, this is data from mass spectrometry experiments. Regards, -- Li-Thiao-Té Sébastien