Thanks! I will have to study this example a bit more closely. There have already been other Python to PDL tutorial attempts on Perl Monks. For example: https://www.perlmonks.org/?node_id=1213987
It might make it a bit easier for newcomers to get oriented. Would anyone object to including such a tutorial into the PDL documents and/or website, once it is compiled and edited? On Sat, Jul 13, 2019 at 8:45 PM Luis Mochan <[email protected]> wrote: > > How about > > pdl> $a=pdl(1,2,3) > > pdl> p pdl($a(*3),$a(:,*3))->flat > [1 1 1 2 2 2 3 3 3 1 2 3 1 2 3 1 2 3] > pdl> > > though you might prefer > > pdl> p append($a(*3)->flat,$a(:,*3)->flat) > [1 1 1 2 2 2 3 3 3 1 2 3 1 2 3 1 2 3] > > to avoid problems when the shapes of the intermediate arrays are > incompatible. The *3 inserts a dummy dimension of size 3 in the first > place, producing three identical columns, while :,*3 produces a dummy > dimension of size 3 as the second index, so you produce tree identical > columns, > > pdl> p $a(*3) > > [ > [1 1 1] > [2 2 2] > [3 3 3] > ] > > pdl> p $a(:,*3) > > [ > [1 2 3] > [1 2 3] > [1 2 3] > ] > > ->flat makes them 1D and append puts one after the other. > > > Regards, > Luis > > > > > On Sat, Jul 13, 2019 at 02:54:34PM -0400, Robert Ryley wrote: > > I've been working on translating some NumPY examples into PDL. There > > has been some positive reinforcement on Perl Monks as can be seen > > here: > > > > https://www.perlmonks.org/?node_id=1233413 > > > > I am stuck on the following NumPy example: > > > > Q. Create the following pattern without hardcoding. Use only numpy > > functions and the below input array a. > > > > Input: > > a = np.array([1,2,3])` > > > > Desired Output: > > array([1, 1, 1, 2, 2, 2, 3, 3, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]) > > > > Solution > > np.r_[np.repeat(a, 3), np.tile(a, 3)] > > #> array([1, 1, 1, 2, 2, 2, 3, 3, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]) > > > > Does PDL have something equivalent to NumPy's "tile" function? I've > > looked through the docs and do not see anything obvious to solve the > > problem. > > > > > > _______________________________________________ > > pdl-general mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/pdl-general > > > > -- > > o > W. Luis Mochán, | tel:(52)(777)329-1734 /<(*) > Instituto de Ciencias Físicas, UNAM | fax:(52)(777)317-5388 `>/ /\ > Apdo. Postal 48-3, 62251 | (*)/\/ \ > Cuernavaca, Morelos, México | [email protected] /\_/\__/ > GPG: 791EB9EB, C949 3F81 6D9B 1191 9A16 C2DF 5F0A C52B 791E B9EB > > > _______________________________________________ > pdl-general mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/pdl-general _______________________________________________ pdl-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/pdl-general
