[GiNaC-list] writing symbols and expressions into binary files

[Cristobal Navarro]

i just wanted to add that "archive_ex" and "unarchive_ex" works only and
only for single expressions. If someone wants to save lists of matrixes like
i needed, you can use "archive_node" which is great too.
it can save you lots of time
best regards,
Cristobal

On Sun, Jun 6, 2010 at 2:19 PM, Cristobal Navarro <axischire at gmail.com>wrote:

> hello Alexei,
>
> thanks very much for you indications, i cleared up my mind now.
> i have tested the method of archiving, it works very good! its crazy it
> even worked for storing a whole matrix of expressions, great and perfect.
>
> additionally, thanks to ginac's great modularism,
> i was able to add some extra binary header information at the beginning of
> the same file (like the number of elements stored), because some information
> was dynamic and unknown for the program.
>
> i guess ginac's archive tool internally serializes its objects, something i
> wasnt doing on my program.
>
> i only have this little question (for the future), has someone worked with
> ginac and distributed systems (clusters), ? sending and receiving ginac type
> objects between nodes ?
> would it be possible to send the "archive" which is serialized already
> (maybe im completely wrong) through an MPI send/receive instruction??
> i will eventually look into this the following weeks to come, but meanwhile
> any answer will be very helpful to clear up the scenario.
>
> best regards and thank you very much
>
> Cristobal <http://www.youtube.com/neoideo>
>
>
> On Sun, Jun 6, 2010 at 9:31 AM, Alexei Sheplyakov <
> alexei.sheplyakov at gmail.com> wrote:
>
>> Hello,
>>
>> On Fri, Jun 04, 2010 at 06:05:26PM -0400, Cristobal Navarro wrote:
>> > is it possible to write ginac symbols and expressions into a file as
>> binary
>> > format??
>>
>> Yes. It's documented in the manual (section 5.15.4, titled as
>> `Archiving').
>>
>> > i've tried this but i get segmentation fault when printing the read
>> > variables. you can try this one file example to see the problem.
>>
>> That code is not going to work (with any non-POD data type). Perhaps you
>> should read something about serialization. A good starting point is
>> http://www.parashift.com/c++-faq-lite/serialization.html
>>
>> Best regards,
>>        Alexei
>>
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>
>
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