System Function VR: Difference between revisions

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     ∇</pre></apll>
     ∇</pre></apll>


<p>If the function named in <apll>R</apll> is directly assigned, the result is the character vector representation of that function (see line 4 above), as in</p>
<p>If the function named in <apll>R</apll> is directly assigned, the result is the character vector representation of that function (see the test in line 3 above), as in</p>


<apll><pre>
<apll><pre>
       f←+.×
       f←+.×
       ⍴⎕←⎕vr 'f'
       ⍴⎕←⎕VR 'f'
+.×
+.×
3
3

Revision as of 23:39, 15 April 2018

Z←⎕VR R returns the visual representation of the user-defined function or operator named in R.
R is a character scalar or vector.
Z is a character vector representation of the user-defined function/operator.

This function is implemented via the Magic Function #MonVR.

For example 

      ⎕VR '#MonVR'
    ∇ Z←#MonVR R;L ⎕IO
[1]   ⎕IO←0 ⋄ Z←1 ##.⎕CR R
[2]   →(0≠⍴Z)/L1 ⋄ Z←'' ⋄ →0
[3]   L1:→(1=≡Z)/0
[4]   L←'∇'∊0⊃Z
[5]   Z←(∊((⊂[1]'LO<    ∇>P<[>Q<]>I6' ⎕FMT⍳⍴Z),¨Z),¨⎕TCNL),'    ∇'
[6]   →L/0 ⋄ Z←Z,(' ',⍕2 ##.⎕AT R),' (UTC)'
    ∇

If the function named in R is directly assigned, the result is the character vector representation of that function (see the test in line 3 above), as in

      f←+.×
      ⍴⎕←⎕VR 'f'
+.×
3


Note: ⎕VR is a monadic form system function, you cannot assign a value to it.

System Variables (A value may be assigned to these except for ⎕DM)
⎕ALX ⎕CT ⎕DM ⎕DT ⎕ELX ⎕FC ⎕FEATURE ⎕FPC ⎕IC ⎕IO
⎕LR ⎕LX ⎕PP ⎕PR ⎕PW ⎕RL ⎕SA ⎕WSID
Niladic System Functions (a value cannot be assigned to these)
⎕A ⎕AV ⎕EM ⎕ET ⎕LC ⎕NNAMES ⎕NNUMS ⎕SI ⎕SYSID ⎕SYSVER
⎕T ⎕TC ⎕TCBEL ⎕TCBS ⎕TCESC ⎕TCFF ⎕TCHT ⎕TCLF ⎕TCNL ⎕TCNUL
⎕TS ⎕WA
Monadic or dyadic system functions (a value cannot be assigned to these)
⎕AT ⎕CR ⎕DC ⎕DFT ⎕DL ⎕DR ⎕EA ⎕EC ⎕ERROR ⎕ES
⎕EX ⎕FMT ⎕FX ⎕MF ⎕NAPPEND ⎕NC ⎕NCREATE ⎕NERASE ⎕NINFO ⎕NL
⎕NLOCK ⎕NREAD ⎕NRENAME ⎕NREPLACE ⎕NRESIZE ⎕NSIZE ⎕NTIE ⎕NUNTIE ⎕STOP ⎕TF
⎕TRACE ⎕UCS ⎕VR
Note that quad functions and variables (except for the ⎕A family of functions) are case insensitive


See Also
System Commands System Variables and Functions Operators


Keyboard
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Alt ⋄ ¨ ¯ < ≤ ∅ ≥ > ≠ ∨ ∧ × ÷
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Shift Q W E R T Y U I O P { } |
Key q w e r t y u i o p [ ] \
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Alt ⍺ ⌈ ⌊ ∞ ∇ ∆ ∘ ‼ ⎕ ⍎ ⍕
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Key a s d f g h j k l ; '
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Shift Z X C V B N M < > ?
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Tool
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≡ ≢ < ≤ = ≥ > ≠ ∨ ∧ ⍱ ⍲ ↑ ↓ ⊂ ⊃ ⌷ ⍋ ⍒
⍳ ∊ ⍸ ⍷ ∪ ∩ ⊆ ⊇ ~ § π .. , ⍪ ⍴ ⌽ ⊖ ⍉
/ \ ⌿ ⍀ ⊙ ¨ ⍨ ⍤ ⍣ ⍡ ⍥ ⍦ . ∘ ⍠ ‼ ⌻ ∂ ∫ ⍞ ⎕ ⍎ ⍕
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Second Row i j k i j k l g p r v x
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