I see, so
"if ($x{$key1}[$i][$j]{$key2} eq $y{$key3}[$k][$l]{$key4})"
"if ($x{$key1}->[$i]->[$j]->{$key2} eq $y{$key3}->[$k]->[$l]->{$key4})"
in Jmol would be:
if ( (((x[key1])[i])[j])[key2] == ...
and that is a pain because of all the parens. You would like this to read:
if ( x[key1]..[i]..[j]..[key2] == ...
or even:
if ( x[key1].[i].[j].[key2] == ...
No reason we couldn't do that.
Bob
On Fri, Mar 27, 2015 at 7:00 PM, Rolf Huehne <rhue...@fli-leibniz.de> wrote:
> Am 27.03.15 um 21:52 schrieb Robert Hanson:
> > Interesting idea. Rolf. Are you aware of Jmol's recently added ..
> notation?
> >
> > x = {"a": {"1": ["x", "y", "z"], "2": ["I", "II"]}}
> >
> > print x
> > print x..a
> > print x..a..1
> > print x..a..1..2
> >
> > Does that satisfy your needs? It is only for regular arrays or
> > associative arrays with simple keys. You can't do this:
> >
> Usually my hash keys are contained in variables. And as far as I know
> the '..' notation doesn't work with variables.
>
> >
> > Personally, I would not like to try to build Perl-like syntax into Jmol.
> > Overall it is very unlike C++ or Java or JavaScript, and I've tried to
> > keep as close to those as possible. In Perl I believe the -> notation is
> > for /array references:/
> >
> > my @array = (1, 2, 3, 'four');
> > my $reference = \@array;
> > print $reference->[0];
> >
> > not actual array names, right? You can't do this:
> >
> > my @array = (1, 2, 3, 'four');
> > print $array->[0];
> >
> > right? So I would prefer not to add that confusion to the mix.
> >
> Bob, you are right, the '->' is for references. Although it is not
> limited to array references. So with variable names it can only be used
> at the second level or higher. But I wasn't suggesting to change that
> within Jmol.
>
> > Ambiguity of ranges: It's not that there is any ambiguity. I assure you
> > that is not the case. But Jmol's notation is a bit idiosyncratic, I
> > admit. The fact that the first model in a file was always "1" led me to
> > develop 1 as the base for array elements. Was it a good choice? Maybe
> > not. But that's what we have. And the fact that we often want the last
> > model suggested then that [0] could mean "the last" rather than "the
> > first". And so we have ranges such as a[3][-3]. It's not ambiguous. But
> > it is multipurpose. So, as you point out, for associative arrays,
> > a[1][1] is not a range. (What would a "range" in an associative array
> > mean, after all.) It must be that "1" is a key in a, and that key
> > refers to either another associative array with a "1" key or a serial
> > array with at least one element. (Maybe that's what you mean by
> > "ambiguous". That's true.)
> >
> What I mean by "ambiguous" is that you don't know at first sight what an
> expression like "x[1][3]" will actually mean. You have to analyze
> carefully what is contained within "x". The '->' notation would change
> that. For Jmol it will hopefully be always clear. But for someone
> looking at foreign or own older code it might take some more time to
> fully understand it.
>
> What I really like with the '->' notation is that it makes working with
> multi-level data structures in Perl much more efficient for me (saving
> development and debug time).
> See for example the following expressions:
>
> "if ($x{$key1}[$i][$j]{$key2} eq $y{$key3}[$k][$l]{$key4})"
>
> "if ($x{$key1}->[$i]->[$j]->{$key2} eq $y{$key3}->[$k]->[$l]->{$key4})"
>
> Regards,
> Rolf
>
>
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--
Robert M. Hanson
Larson-Anderson Professor of Chemistry
Chair, Department of Chemistry
St. Olaf College
Northfield, MN
http://www.stolaf.edu/people/hansonr
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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conversation now. http://goparallel.sourceforge.net/
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