Sorry, it should be
$shuffled = $data(qsorti(random($data))) Marek On Thu, 6 Aug 2015 at 18:11 Marek Gierliński <[email protected]> wrote: > I normally do it this way > > $shuffled = $data(qsorti(random($x))) > > Marek > > On Thu, 6 Aug 2015 at 18:06 David Mertens <[email protected]> > wrote: > >> Hey Nick, >> >> I'm not sure how fast this is, but this is what I do when I need to >> randomly sort things: >> >> # Assuming you have $data already declared... >> $shuffled = cat($data->random, $data)->transpose->qsortvec->(1)->flat >> >> The call "->(1)" is a NiceSliceism; replace with a slice method call if >> that's not on. >> >> Bear in mind that PDL's random number generator is Perl's default, which >> is not sufficiently random for most Monte Carlo stuff. I've never needed >> anything more sophisticated for my work, but I suspect that the PDL >> bindings to GSL provide random generators of higher quality. >> >> Good luck! >> David >> >> On Thu, Aug 6, 2015 at 12:59 PM, Nick Wright <[email protected]> >> wrote: >> >>> Hi everyone >>> >>> I need help with something that I think *should* be simple with Perl/PDL >>> but I can't find the command for it. >>> >>> I basically just want to randomly re-order a 1-dimensional, moderately >>> long (1500 entries) piddle and I can't find a simple way. I need to do this >>> for the purposes of a Monte Carlo simulation, so I was hoping PDL might >>> have an efficient way to do it so I can repeat is 1000s of times quickly! >>> >>> Thanks in advance for the help! >>> >>> Cheers, >>> >>> Nick >>> >>> >>> ------------------------------------------------------------------------------ >>> >>> _______________________________________________ >>> pdl-general mailing list >>> [email protected] >>> https://lists.sourceforge.net/lists/listinfo/pdl-general >>> >>> >> >> >> -- >> "Debugging is twice as hard as writing the code in the first place. >> Therefore, if you write the code as cleverly as possible, you are, >> by definition, not smart enough to debug it." -- Brian Kernighan >> >> ------------------------------------------------------------------------------ >> _______________________________________________ >> pdl-general mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/pdl-general >> > -- > Dr Marek Gierliński > The Data Analysis Group > The Barton Group > Computational Biology and GRE > School of Life Sciences > University of Dundee, Dundee, Scotland, UK. > Tel: +44 1382 386427 > www.compbio.dundee.ac.uk/dag.html > -- Dr Marek Gierliński The Data Analysis Group The Barton Group Computational Biology and GRE School of Life Sciences University of Dundee, Dundee, Scotland, UK. Tel: +44 1382 386427 www.compbio.dundee.ac.uk/dag.html
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