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To expand a little on what has previously been said ... dfns implement Static Single Assignment (SSA) - every time a value is named using ← the name automatically shadows any previous value. Thus in this example: ⎕cr 'ros' ros←{ a←1 a←2 a } ros 0 2 a VALUE ERROR: Undefined name: a a ∧ the first assig ...

That looks like it is quite closely paraphrasing Wikipedia: APL (named after the book A Programming Language)[3] is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols[4] to ...

Component files exist outside of even a workspace (ties remain even if you )CLEAR ), so any kind of ⎕IO sensitivity is probably out of the question. Component numbers are mostly used as labels; their exact numerical value doesn't seem too relevant to me and I'm not sure I think it would add much u ...

After some investigation I have elected not to patch the earlier versions. The potential to destabilise the current release has to be taken into account and compared against the severity of the issue being resolved - and in this case the fix is non-trivial and not easily back-ported, and the issue ...

The namespace display form should not have been exposed by ⎕JSON at all. That has been fixed in the development interpreter (18.0) but not earlier versions; the reference for the fix is Mantis 16644.

I will reopen that issue to get the fix ported to all supported versions.

Not via the non-commercial download pages. 32-bit and Classic (non-Unicode) builds of the interpreter are legacy editions which are only available to users with a commercial licence. The exception is the Raspberry Pi version, which is only available as a 32-bit version.

It is deliberate, but I'll raise an issue to clarify the docs, and put in QA to ensure it remains so. The thinking behind variant is this: it takes a function and modifies it so that it has different properties - for example, ⎕JSON produces "compact" JSON when it exports APL data, but you can change ...

A couple more things to note: When you replaced your large components with small ones, the areas of the file originally occupied by the large components were "freed", and large unused gaps were left in the file. Although you did not see any immediate file size reduction, you could use ⎕FRESIZE to s ...

Thanks for the suggestion; I can confirm that 18.0 (due for release next year) will likely have this feature. It is under development and experimental so may not appear exactly in this form - or, even, at all - but the current behaviour is that when the cursor is over a name then all other ...

The format is the default of the standard C library date formatting functions:

http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html