Re: [Discuss-gnuradio] maxtrix inverse

[Michael Berman]

I have had success using armadillo matrix inversions within GNURadio.  The only thing you need to be careful of is that when you install the library you need to ensure that you install the hardware accelerated versions of BLAS and LAPACK; I have seen this result in a 200 X slowdown.  For a 64*64 matrix, armadillo will be able to keep up with your data fairly well.  On my machine with an AMD A8 processor running Fedora 20, such an operation would take less than 1 ms.

Michael Berman

On Thu, Mar 20, 2014 at 7:00 AM, Tom Rondeau <address@hidden> wrote:

On Thu, Mar 20, 2014 at 7:15 AM, Moritz Fischer
<address@hidden> wrote:
> Well you could implement your Matrix inversion using VOLK, of course.
> But to my knowledge you'd have to write the necessary kernels yourself.
>
> Cheers,
>
> Moritz

No, but it would be nice to have a kernel for that.

The caveat is that VOLK is really meant for and designed to work with
vectors, not matrices. So you'd have to adapt the concept to work with
the matrix as a long vector and provide the dimensions to the kernel.

Tom

> On Thu, Mar 20, 2014 at 12:13 PM, Nasi <address@hidden> wrote:
>>
>> Can we replace Eigen with VOLK in some extent?
>>
>> -
>> NE
>>
>> Понедельник, 17 марта 2014, 11:50 +01:00 от Moritz Fischer
>> <address@hidden>:
>>
>> Hi BZS,
>>
>> Eigen is a pretty good library. Other's that might come to might is
>> using blas/lapack in fortran or armadillo. I wouldn't expect too much
>> of a speedup when compared to Eigen though. For examples on how to use
>> fortran or armadillo with GNU Radio look at the gr-specest out of tree
>> module.
>>
>> Cheers,
>>
>> Moritz
>>
>> On Mon, Mar 17, 2014 at 8:49 AM, 猪猪猪猪猪猪头 <address@hidden> wrote:
>> > hi,
>> > when i deal data in my block,i want to scramble the positions symbol in
>> > a
>> > frame,and at receiver-end descramble these symbols,get correct the
>> > order,for this purpose,i need to compute the inverse of 64*64 matrix,and
>> > when i used the eigen library ,it works slowly wnen compare with the
>> > deal
>> > data speed of gnuradio,anyone could give me some other libraries or
>> > other
>> > methods to satify my need,
>> > thanks ,
>> > BZS
>> >
>> > _______________________________________________
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>>
>> --
>> NE
>
>
>
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