System Variable IO: Difference between revisions

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⎕IO determines the lowest subscript for arrays. The default is 1, but can be changed to 0. If an attempt is made to set ⎕IO to a value higher than 1, it is set to 1. If an attempt is made to set ⎕IO to a value loweer than 0, it is set to 0. Setting ⎕IO to anything other than a number causes a DOMAIN ERROR.  
⎕IO determines the lowest subscript for arrays. The default is 1, but can be changed to 0. If an attempt is made to set ⎕IO to a value higher than 1, it is set to 1. If an attempt is made to set ⎕IO to a value loweer than 0, it is set to 0. Setting ⎕IO to anything other than a number causes a DOMAIN ERROR.  


<pre>
    ⎕IO    ⍝ default ⎕IO (quad IO) is 1 in a clear workspace
1
      ⍳5    ⍝ iota 5
1 2 3 4 5
      ⎕IO←0    ⍝ Set index origin ⎕IO to 0 (zero)
      ⍳5  ⍝ iota 5 again but compare the results just below to just above
0 1 2 3 4
</pre>


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Revision as of 14:45, 8 February 2016

⎕IO - Index Origin

Z←⎕IO returns the current value of the Index Origin.
Z is an integer vector containing the current value of ⎕IO. This is the lowest value of an array subscript, and is either 1 or 0.


⎕IO←0 set the lowest subscript of an array to 0.
⎕IO←1 sets the lowest subscript for arrays to 1


⎕IO determines the lowest subscript for arrays. The default is 1, but can be changed to 0. If an attempt is made to set ⎕IO to a value higher than 1, it is set to 1. If an attempt is made to set ⎕IO to a value loweer than 0, it is set to 0. Setting ⎕IO to anything other than a number causes a DOMAIN ERROR. 

    ⎕IO    ⍝ default ⎕IO (quad IO) is 1 in a clear workspace
1
      ⍳5    ⍝ iota 5
1 2 3 4 5 

      ⎕IO←0     ⍝ Set index origin ⎕IO to 0 (zero)

      ⍳5   ⍝ iota 5 again but compare the results just below to just above
0 1 2 3 4
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


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Shift ~ ! @ # $ % ^ & * ( ) _ +
Key ` 1 2 3 4 5 6 7 8 9 0 - =
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Alt ? ⍵ ∊ ⍴ § ↑ ↓ ⍳ ○ π ← → ⊢
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 ⍺ ⌈ ⌊ ∞ ∇ ∆ ∘ ‼ ⎕ ⍎ ⍕
Shift A S D F G H J K L : "
Key a s d f g h j k l ; '
Alt+Shift ⊆ ⊇ χ ⍡ ⍭ ⊙
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Shift Z X C V B N M < > ?
Key z x c v b n m , . /
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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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