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Topic: Binary or Logical Selection : Given an array A and a binary or
logical vector S, how do I select the rows of A when S = 1 or True ?

Replies: 2   Last Post: Sep 24, 2012 5:36 AM

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Posts: 7
Registered: 9/22/12
Re: Binary or Logical Selection : Given an array A and a binary
orlogical vector S, how do I select the rows of A when S = 1 or True ?

Posted: Sep 24, 2012 5:36 AM
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> I can imagine that referees don't like mathematical explanations in
> terms of APL - unless yours is a paper about APL (does the language
> still exist?). But I can't think of an elegant way to express this in
> standard vector notation either. This newsgroup is only concerned with
> the development and application of computer-algebra systems like Maxima
> or Maple, I am therefore widening the audience to include sci.math.
> Can anybody help the original poster?
> Martin.

Thank you indeed Martin,
I understand that, and now have it expressed in Latex.
I will now insert the definition in the paper.

In answer to your question, yes, there are a number of actively developed variants of Apl. I write in a number of array based languages including Maple, Matlab and LabVIEW, but AplX from MicroApl is my favourite - it is multi-tasking, can generate standalone GUIs, and talk to FPGAs, so I use it for my NMR instrumentation control and data analysis.
To see running examples with GUIs and FPGAs, see the YouTube videos pointed to at :
Thanks again, much appreciated,

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