Hi Johannes, Thank you very much! Really appreciate your help.
George On Tue, May 3, 2022 at 10:07 AM Johannes Demel <de...@ant.uni-bremen.de> wrote: > Hi George, > > yes, you need to add `#include <volk/volk_alloc.hh>` to use > `volk::vector`. A `volk::vector` is a specially templated `std::vector`. > You still use it with `.data()`. > An example would be: > ``` > #include <volk/volk.h> > #include <volk/volk_alloc.hh> > > ... > > volk::vector <gr_complex> my_val (240); > volk_32fc_s32fc_multiply_32fc(my_val.data(), my_val.data(), scale, 240); > ``` > > If you look at the `std::vector` docs: > https://en.cppreference.com/w/cpp/container/vector > > You can see `std::vector` has a second template argument that defaults > to `class Allocator = std::allocator<T>`. `volk::vector` provides a > different `Allocator` for it. Thus, you can use a `volk::vector` just > like a `std::vector`. Be aware that different template arguments lead to > different classes and thus, a function that accepts a `std::vector` will > not accept a `volk::vector` and vice versa. > > Cheers > Johannes > > On 03.05.22 16:01, George Edwards wrote: > > Hi Johannes, > > > > Thank you very much! Thanks for also providing an alternative solution > > if I were to define the vector as a volk vector. Please allow me to > > confirm my understanding of how to use volk vectors. So with my current > > definition using std::vector <gr_complex> my_val (240); you and Brian > > suggested the solution should look as follows: > > volk_32fc_s32fc_multiply_32fc(my_val.data(), my_val.data(), scale, 240); > > > > Based on your volk vector suggested solution, my interpretation is that > > I would write my code as follows: > > volk::vector <gr_complex> my_val (240); > > .... > > volk_32fc_s32fc_multiply_32fc(my_val, my_val, scale, 240); // Or do I > > need to use &my_val > > Also, my current code has the following: #include <volk/volk.h>do I in > > addition need to include #include <volk/volk_alloc.hh> ? > > > > Thank you very much! > > George > > > > > > On Tue, May 3, 2022 at 3:35 AM Johannes Demel <de...@ant.uni-bremen.de > > <mailto:de...@ant.uni-bremen.de>> wrote: > > > > Hi George, > > > > All VOLK functions require pointers as you already noticed. You can > > access the underlying data structure of a vector via its `.data()` > > method as Brian noted. > > Moreover, you can use `volk::vector` if you want your vectors to be > > aligned. `volk::vector` is almost a `std::vector` but uses its own > > allocator that ensures alignment. > > `volk::vector` is available in `volk/volk_alloc.hh`. Since it is a > C++ > > only feature. > > > > Cheers > > Johannes > > > > On 03.05.22 04:28, George Edwards wrote: > > > Hello GNURadio Community, > > > > > > I am having a problem using the above function with > > vector parameters. > > > If I use an array say: > > > gr_complex my_val[240]; > > > volk_32fc_s32fc_multiply_32fc(my_val, my_val, scale, 240); > > > > > > It works! But if I change my_val to be a vector like below, it > fails: > > > std::vector <gr_complex> my_val(240); > > > > > > The reason I need to use a vector is that with arrays, the size > > must be > > > known at compile time, while with vectors one can build it at > > runtime. > > > > > > I would appreciate any suggestions. > > > Thank you! > > > > > > George > > >
