[mpich-discuss] URGENT.. Passing Array..

[Anuj Patel]

thankyou very much again..
i will just go through it and try to code it.

Anuj

On Thu, Dec 3, 2009 at 9:22 PM, Dave Goodell <goodell at mcs.anl.gov> wrote:

> I haven't studied your sample code, but you probably want to create two
> datatypes in your program.  One to describe a column in your image and one
> to describe a row in the image.  MPI_Type_vector is probably the most
> straightforward way to create these types.  The MPI Standard [1] (section
> 4.1.2) provides descriptions of how to use this routine, as do many of the
> books out there such as "Using MPI" [2].
>
> You can then send and receive your rows and columns using these derived
> datatypes.
>
> -Dave
>
> [1] http://www.mpi-forum.org/docs/mpi-2.2/mpi22-report.pdf
> [2]
> http://www.amazon.com/Using-MPI-Programming-Engineering-Computation/dp/0262571323
>
>
> On Dec 3, 2009, at 12:51 AM, Anuj Patel wrote:
>
>  Hi thanks for reply.
>>
>> Actually i am trying to paralleling simple HAAR WAVELET.
>>
>> In that i need to take summation and subtraction of  two row/column out of
>> an very large array(which represents an image) and is in N*N form with very
>> large dimensions.
>>
>> so what i want to do is pass two row/column to each worker process.
>> so in that part i am confused how to do that.
>>
>> because i studied matrix multiplication but it just passes one row and a
>> complete array to each worker.
>>
>> i hope i mad it bit clear. and i am attaching serial algo here.
>>
>> Thanks.
>>
>> Anuj Patel
>>
>>
>> On Wed, Dec 2, 2009 at 8:50 PM, Dave Goodell <goodell at mcs.anl.gov> wrote:
>> On Dec 2, 2009, at 2:07 AM, Anuj Patel wrote:
>>
>> can anyone tell me how to pass two row and column at a time.?
>>
>> Can you elaborate a little bit?  Are you trying to pass two rows and two
>> columns of an array as an argument to a function?  Is it in C or Fortran?
>>
>> Or do you mean how to send an MPI message containing the data from two
>> rows and two columns of an array?
>>
>> -Dave
>>
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