Re: Support for more general ranges
gsermaid <[email protected]>
| Newsgroups | gmane.comp.lib.boost.ublas |
|---|---|
| Message-ID | <[email protected]> |
Naso, Thanks for your prompt reply. It would be great to see this integrated. Do I need to do something in order to mark it as a feature request? Giorgos ---------------------------------------------------------------------- Message: 2 Date: Mon, 3 Jun 2013 11:04:40 -0400 From: Nasos Iliopoulos <[email protected]> To: [email protected] Subject: Re: [ublas] Support for more general ranges Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Giorgo, this will probably help you: http://boost.2283326.n4.nabble.com/indirect-array-strikes-back-td2711579.html I don't recall this functionality being integrated though. We should probably mark this as a feature request. -Nasos ---------------------------------------------------------------------- Message: 1 Date: Mon, 3 Jun 2013 15:10:46 +0100 (BST) From: gsermaid <[email protected]> To: "[email protected]" <[email protected]> Subject: Re: [ublas] Support for more general ranges Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Hello again, Further to the recommendation by?oswin krause for trying out vector_indirect, I would like to ask the following. The documentation (http://www.boost.org/doc/libs/1_53_0/libs/numeric/ublas/doc/html/classboost_1_1numeric_1_1ublas_1_1vector__indirect.html#_details) states that a vector_indirect can be constructed by a broad range of vectors of indices, such as? std::vector, ublas::vector or indirect_array.? The problem is I seem to be able to construct an indirect vector using indirect_array types _only_. When for example I use a ublas::vector<size_t> or a std::vector<size_t> as a vector of indices I get a compilation error from gcc 4.7.2 that there is a preprocess member missing. Is the documentation simply out of date and only the use of indirect_arrays is allowed, or is it a bug? Thanks in advance. Regards, Giorgos ________________________________ Message: 1 Date: Mon, 20 May 2013 17:49:30 +0100 (BST) From: gsermaid <[email protected]> To: "[email protected]" <[email protected]> Subject: [ublas] Support for more general ranges Message-ID: ??? <[email protected]> Content-Type: text/plain; charset="iso-8859-1" Hi all, I would like to ask if there is any way to create a vector proxy based on a general range of indices. For example, if I have a vector vector<unsigned> x(4); x <<= 1,2,3,4; and a vector of indices? vector<size_t> k(2); k <<= 0,3; I would like to be able to create a vector proxy as follows vector_proxy<unsigned> mysubvector(x, k); with the property that mysubvector[i] = x[k[i]]. I know I can create a simple new class which provides this functionality but ideally I also want to have all the useful iterator functionality and mathematical operations supported by a typical ublas vector. Is this currently supported? If not, is there an easy way to? implement it and have all the functionality that ublas offer? Finally, do you think something like this could be included in future versions? Regards, Giorgos -------------- next part -------------- HTML attachment scrubbed and removed ------------------------------ Message: 2 Date: 20 May 2013 18:51:54 +0200 From: "oswin krause" <[email protected]> To: [email protected] Subject: Re: [ublas] Support for more general ranges Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Hi, take a look at vector_indirect. On 20.05.2013 18:49, gsermaid wrote: > Hi all, > > I would like to ask if there is any way to create a vector proxy based > on a general range of indices. For example, if I have > a vector > > vector<unsigned> x(4); > x <<= 1,2,3,4; > > and a vector of indices > > vector<size_t> k(2); > k <<= 0,3; > > I would like to be able to create a vector proxy as follows > > vector_proxy<unsigned> mysubvector(x, k); > > with the property that > > mysubvector[i] = x[k[i]]. > > I know I can create a simple new class which provides this > functionality but ideally I also want to have > all the useful iterator functionality and mathematical operations > supported by a typical ublas vector. Is this currently supported? If > not, is there an easy way to > implement it and have all the functionality that ublas offer? Finally, > do you think something like this could be included in future versions? > > Regards, > Giorgos > > > _______________________________________________ > ublas mailing list > [email protected] > http://lists.boost.org/mailman/listinfo.cgi/ublas > Sent to: [email protected] -------------- next part -------------- HTML attachment scrubbed and removed ------------------------------ Subject: Digest Footer _______________________________________________ ublas mailing list [email protected] http://lists.boost.org/mailman/listinfo.cgi/ublas ------------------------------ End of ublas Digest, Vol 102, Issue 11 ************************************** -------------- next part -------------- HTML attachment scrubbed and removed ------------------------------ Subject: Digest Footer _______________________________________________ ublas mailing list [email protected] http://lists.boost.org/mailman/listinfo.cgi/ublas ------------------------------ End of ublas Digest, Vol 102, Issue 12 ************************************** -------------- next part -------------- HTML attachment scrubbed and removed ------------------------------ Message: 2 Date: Mon, 3 Jun 2013 11:04:40 -0400 From: Nasos Iliopoulos <[email protected]> To: [email protected] Subject: Re: [ublas] Support for more general ranges Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Giorgo, this will probably help you: http://boost.2283326.n4.nabble.com/indirect-array-strikes-back-td2711579.html I don't recall this functionality being integrated though. We should probably mark this as a feature request. -Nasos On 06/03/2013 10:10 AM, gsermaid wrote: > Hello again, > > Further to the recommendation by oswin krause for trying out > vector_indirect, I would like to ask the following. > The documentation > (http://www.boost.org/doc/libs/1_53_0/libs/numeric/ublas/doc/html/classboost_1_1numeric_1_1ublas_1_1vector__indirect.html#_details) > states that a vector_indirect can be constructed by a broad range of > vectors of indices, such as > std::vector, ublas::vector or indirect_array. > > The problem is I seem to be able to construct an indirect vector using > indirect_array types _only_. When for example I use a > ublas::vector<size_t> or a std::vector<size_t> as a vector of indices > I get a compilation error from gcc 4.7.2 that there is a preprocess > member missing. > > Is the documentation simply out of date and only the use of > indirect_arrays is allowed, or is it a bug? Thanks in advance. > > Regards, > Giorgos > > > ------------------------------------------------------------------------ > > Message: 1 > Date: Mon, 20 May 2013 17:49:30 +0100 (BST) > From: gsermaid <[email protected] <mailto:[email protected]>> > To: "[email protected] <mailto:[email protected]>" > <[email protected] <mailto:[email protected]>> > Subject: [ublas] Support for more general ranges > Message-ID: > ??? <[email protected] > <mailto:[email protected]>> > Content-Type: text/plain; charset="iso-8859-1" > > Hi all, > > I would like to ask if there is any way to create a vector proxy based > on a general range of indices. For example, if I have > a vector > > vector<unsigned> x(4); > x <<= 1,2,3,4; > > and a vector of indices? > > vector<size_t> k(2); > k <<= 0,3; > > I would like to be able to create a vector proxy as follows > > vector_proxy<unsigned> mysubvector(x, k); > > with the property that > > mysubvector[i] = x[k[i]]. > > I know I can create a simple new class which provides this > functionality but ideally I also want to have > all the useful iterator functionality and mathematical operations > supported by a typical ublas vector. Is this currently supported? If > not, is there an easy way to? > implement it and have all the functionality that ublas offer? Finally, > do you think something like this could be included in future versions? > > Regards, > Giorgos > -------------- next part -------------- > HTML attachment scrubbed and removed > > ------------------------------ > > Message: 2 > Date: 20 May 2013 18:51:54 +0200 > From: "oswin krause" <[email protected] > <mailto:[email protected]>> > To: [email protected] <mailto:[email protected]> > Subject: Re: [ublas] Support for more general ranges > Message-ID: <[email protected] > <mailto:[email protected]>> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" > > Hi, > > take a look at vector_indirect. > > On 20.05.2013 18:49, gsermaid wrote: > > Hi all, > > > > I would like to ask if there is any way to create a vector proxy based > > on a general range of indices. For example, if I have > > a vector > > > > vector<unsigned> x(4); > > x <<= 1,2,3,4; > > > > and a vector of indices > > > > vector<size_t> k(2); > > k <<= 0,3; > > > > I would like to be able to create a vector proxy as follows > > > > vector_proxy<unsigned> mysubvector(x, k); > > > > with the property that > > > > mysubvector[i] = x[k[i]]. > > > > I know I can create a simple new class which provides this > > functionality but ideally I also want to have > > all the useful iterator functionality and mathematical operations > > supported by a typical ublas vector. Is this currently supported? If > > not, is there an easy way to > > implement it and have all the functionality that ublas offer? Finally, > > do you think something like this could be included in future versions? > > > > Regards, > > Giorgos > > > > > > _______________________________________________ > > ublas mailing list > > [email protected] <mailto:[email protected]> > > http://lists.boost.org/mailman/listinfo.cgi/ublas > > Sent to: [email protected] > <mailto:[email protected]> > > -------------- next part -------------- > HTML attachment scrubbed and removed > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > ublas mailing list > [email protected] <mailto:[email protected]> > http://lists.boost.org/mailman/listinfo.cgi/ublas > > > ------------------------------ > > End of ublas Digest, Vol 102, Issue 11 > ************************************** > -------------- next part -------------- > HTML attachment scrubbed and removed > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > ublas mailing list > [email protected] <mailto:[email protected]> > http://lists.boost.org/mailman/listinfo.cgi/ublas > > > ------------------------------ > > End of ublas Digest, Vol 102, Issue 12 > ************************************** > > > > > _______________________________________________ > ublas mailing list > [email protected] > http://lists.boost.org/mailman/listinfo.cgi/ublas > Sent to: [email protected] -------------- next part -------------- HTML attachment scrubbed and removed ------------------------------ Subject: Digest Footer _______________________________________________ ublas mailing list [email protected] http://lists.boost.org/mailman/listinfo.cgi/ublas ------------------------------ End of ublas Digest, Vol 103, Issue 2 ************************************* _______________________________________________ ublas mailing list [email protected] http://lists.boost.org/mailman/listinfo.cgi/ublas Sent to: [email protected]