Re: Send a RealArray over a Socket

On Thu, 16 Aug 2007, Gergely Buday wrote:
>> I am trying to send a RealArray over a socket.
>> However, I noticed that the sendArray function works
>> only with Word8Arrays. What is the best way to send a
>> large RealArray efficiently over a socket?
>>
>> Do I have to convert the RealArray into a Word8Array?
>
> Dear Vaishali,
>
> as John wrote you have to have a Word8Array to send it over a socket.
> But an option would be to write a wrapper structure around Word8Array
> that implements a part of RealArray's signature. It's not clear what
> do you use to compute the RealArray but in an optimist's view it's
> enough to implement sub, update and tabulate. And a simple function
> that exports the underlying Word8Array that you will use only to send
> it over a socket. What do you think of this?

The structures that match the PACK_REAL signature are provided by the 
Basis Library as a convenient way of packing real values into a 
Word8Array:
   http://www.standardml.org/Basis/pack-float.html

As Gergely suggests, if you can organize your computation so that you 
write the elements of the "final RealArray" directly into a Word8Array 
via PackRealLittle.update, then you won't have any additional copying.

-Matthew


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