Hi folks, I added the warning because I found the behaviour surprising when adding tests. My plan now is that ci() will go away, so my proposal is to use it as “ci()” for now, bearing in mind it’s only temporary. How does that sound? Sorry about the API change. If we had a proper bit in the docs about handling of complex numbers, I’d have added a warning that it should be considered experimental and subject to change. If anyone has ideas about the best location for such docs, please say :-)
By the way, there is a PDL 2.028_01 that’s intended to fix a few remaining gremlins in native-complex on older (and buggy/incomplete) libm’s on FreeBSD and CentOS, together with some updates I’ve incorporated out of the PDLA distros. If it tests Ok, I’ll be full-releasing 2.029 quite soon, then looking at the PDL::Complex integration. Best regards, Ed From: Luis Mochan<mailto:moc...@icf.unam.mx> Sent: 08 March 2021 15:15 To: pdl-general@lists.sourceforge.net<mailto:pdl-general@lists.sourceforge.net> Subject: Re: [Pdl-general] [Pdl-devel] PDL 2.027 released Hi Ingo, On Mon, Mar 08, 2021 at 03:35:36PM +0100, Ingo Schmid wrote: > ... > Now, looking into PDL::Ops you will see this warning: > > Returns the complex number 0 + 1i. > > B<WARNING> because this is not defined as a constant (with empty > prototype), you must use it either as C<10*ci> or C<ci()*10>. If you > use it as C<ci*10> this will actually try to use 10 as a glob and pass > that to C<ci>, which will not do what you want. Yes, I saw the warning. Nevertheless, having $x+ci!=$ci+$x would surprise many. For this reason, I guess it would be a good idea in the meantime, before the merge with PDL::Complex mentioned by Ed, to give an explicit error or warning message whenever ci is called, most probably inadvertently, with an actual non-null argument, or else, to promote the use of a 'true' constant (maybe CI), similar to the 'i' of PDL::Complex, instead of the function ci. Would use constant CI=>ci; # or sub CI () {state $i=ci; return $i;} my $z=$x+$y*CI; # ==$x+CI*$y be more expensive than my $z=$x+$y*ci; # !=$x+ci*$x ? If not, then the current ci could be hidden from the users and CI above exported (maybe with a better choice of names). Best regards, Luis
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