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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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dr.beauwebber@googlemail.com

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
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply


> 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 :
http://www.lab-tools.com/instrumentation/#FPGA_Modular_Firmware_Skeleton
Thanks again, much appreciated,
cheers,
Beau



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