I've got this error: /tmp/ccE79VRG.o: In function `main': t2_rx_ompalg.cc:(.text+0x6a5): undefined reference to `volk_32fc_x2_dot_prod_32fc' collect2: error: ld returned 1 exit status I was running it inside main function as g++ -std=c++11 t2_rx_ompalg.cc -o t2_rx_ompalg -lm -lfftw3 Do you know what is it for?
- NE Thu, 20 Mar 2014 13:04:02 -0400 от Tom Rondeau <t...@trondeau.com>: >On Thu, Mar 20, 2014 at 12:51 PM, Nasi < nesaz...@mail.ru > wrote: >> Thanks! >> >> As I see you apply it to the first element of x as in >> volk_32fc_something_32fc(&x[0], ...);. >> I want to multiply the whole vector like as a inner product of two vectors. >> Is it possible? >> >> - >> NE > >Not sure I exactly follow your comment, but you can do something like this: > >int N; >vector<gr_complex> x(N); >vector<gr_complex> y(N); >vector<gr_complex> z(N); > >// fill x and y with stuff > >volk_32fc_x2_dot_prod_32fc(&z[0], &x[0], &y[0], N); > >That will take the dot product of x and y and put the results in z. > >Tom > > >> Четверг, 20 марта 2014, 10:28 -04:00 от Tom Rondeau < t...@trondeau.com >: >> >> On Thu, Mar 20, 2014 at 10:09 AM, Aditya Dhananjay < adi...@cs.nyu.edu > >> wrote: >>> I had the same question. Thanks! :) >> >> One thing that I forgot to mention is that VOLK is written purely in >> C, so C++ vectors as-is won't work. You need to index them, but >> luckily, std::vector's are guaranteed to be contiguous in memory when >> indexed. >> >> In other words: >> >> std::vector<gr_complex> x; >> volk_32fc_something_32fc(&x[0], ...); >> >> Tom >> >> >> >>> On Thu, Mar 20, 2014 at 10:07 AM, Tom Rondeau < t...@trondeau.com > wrote: >>>> >>>> On Thu, Mar 20, 2014 at 7:05 AM, Nasi < nesaz...@mail.ru > wrote: >>>> > Hi all, >>>> > >>>> > I am using ubuntu 13.04, GNUradio 3.7. >>>> > I have a question related to VOLK library. >>>> > >>>> > When I create a vector, lets say: >>>> > >>>> > vector<gr_complex> y1; >>>> > >>>> > Can I multiply this vector to another vector using VOLK? >>>> > Is there any good documentation for this? >>>> > >>>> > -- >>>> > NE >>>> >>>> Myself and Nick McCarthy have published and presented on VOLK. Here's >>>> a pretty good overview video of using it: >>>> http://www.trondeau.com/blog/2013/6/12/nearly-50-minutes-of-volk.html >>>> >>>> To answer your question, yes, building a vector like that is >>>> acceptable for use with volk kernels as long as you are using the >>>> correct data types. Be aware of alignment requirements, though, which >>>> the link above explains. >>>> >>>> Tom >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>> >> >> >> >> -- >> NE -- NE
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