[Kst] if then else in equations?

Thu Sep 20 16:21:41 UTC 2012

Back when George switched to yacc/bison, I thought my favorite operator, ?:, was added.  I do recall George sending out an email asking which operators should be added and I can’t believe I would have forgotten the ternary operator. Then again, maybe there is a reason it wasn't added?  If not, this is what is needed here.

http://en.wikipedia.org/wiki/%3F:

Matthew Truch
Group 75
MIT Lincoln Lab
781-981-2773
matthew.truch at ll.mit.edu

From: kst-bounces at kde.org [mailto:kst-bounces at kde.org] On Behalf Of Barth Netterfield
Sent: Thursday, September 20, 2012 11:35 AM
To: kst at kde.org
Subject: Re: [Kst] if then else in equations?

We don't have if/else/elseif and I don't currently have plans for it - mostly since I've never come up with a situation in equations where you couldn't do it with the comparison operators.

You can submit a wishlist, of course :-)

As to how hard it would be to add it?  Well - George replaced my hand-rolled parser years and years ago with a yacc parser, so I would have to learn yacc/bison whatever, and then see how hard it would be to add it.

cbn

On Thu, Sep 20, 2012 at 11:11 AM, Brisset, Nicolas <Nicolas.Brisset at eurocopter.com> wrote:
Hi Barth,

OK, you’re right. That would do it.
Now, don’t misunderstand my previous message: this was just an example ☺ There are many cases and they can probably not always be handled like that. Plus, it’s not very “discoverable”. And doesn’t handle if / elseif / else constructs…
So, do we have if / then / else (or even better if / elseif / else /), or plans to add that in any non-geeky way?

Nicolas

Von: kst-bounces at kde.org [mailto:kst-bounces at kde.org] Im Auftrag von Barth Netterfield
Gesendet: Donnerstag, 20. September 2012 16:57
An: kst at kde.org
Betreff: Re: [Kst] if then else in equations?

([V1]>180)*([(V1)]-360) + ([V1]<=180)*[(V1)]
On Thu, Sep 20, 2012 at 10:45 AM, Brisset, Nicolas <Nicolas.Brisset at eurocopter.com> wrote:
Hi,

one stupid little question: is there a possibility to use an if / then / else construct in equations?
I’d like to do something like if ([Vector1 (V1)] > 180) then [Vector1 (V1)]-360 else [Vector1 (V1)]

Thanks for any hints. If there’s no way to do that, we should consider adding it to the parser. No idea how difficult that would be though.

Nicolas

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C. Barth Netterfield
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