System Variable LR: Difference between revisions

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<h1>{quad}DQ - DEFINITION NEEDED</h1>
<h1><aplxx>⎕LR</aplxx> - Left/Right Direction Choice</h1>
{{BoxStart|⎕DQ
{{BoxStart|<apll>Z←⎕LR</apll>
| DEFINITION NEEDED}}
| returns the current value of the Left/Right Direction Choice. }}
{{BoxEnd|⎕DQ←'<i>VALUE</i>'}}
{{BoxEnd|<apll>Z</apll> is a character scalar containing the current value of <apll>⎕LR</apll>. This is the value used by certain primitive functions when a choice of Left vs.Right is needed such as when dividing non-commutative numbers or when returning the matrix representation of an Octonion number &mdash; the value is either <apll>'l'</apll> or <apll>'r'</apll>.}}<br/>


Description here - to do
{| border="1" cellpadding="5" cellspacing="0" rules="none" summary=""
|| <apll>⎕LR←'l'</apll> || sets the Left/Right Direction Choice to Left
|-
| valign="top" |<apll>⎕LR←'r'</apll> || sets the Left/Right Direction Choice to Right
|-
|}
 
<apll><pre>
      a←<⍳4
      b←<⌽⍳4
      ⎕LR←'l' ⋄ a÷b
0.66667<hc>i</hc>0<hc>j</hc>0.66667<hc>k</hc>0.33333
      ⎕LR←'r' ⋄ a÷b
0.66667<hc>i</hc>0.33333<hc>j</hc>0<hc>k</hc>0.66667</pre></apll>
 
This setting may be localized to an individual function via the [[Variant]] operator:
 
<apll><pre>
      a÷⍠'l' b
0.66667<hc>i</hc>0<hc>j</hc>0.66667<hc>k</hc>0.33333
      a÷⍠'r' b
0.66667<hc>i</hc>0.33333<hc>j</hc>0<hc>k</hc>0.66667
</pre></apll>


{{System Variables}}
{{System Variables}}
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Latest revision as of 12:54, 16 April 2018

⎕LR - Left/Right Direction Choice

Z←⎕LR returns the current value of the Left/Right Direction Choice.
Z is a character scalar containing the current value of ⎕LR. This is the value used by certain primitive functions when a choice of Left vs.Right is needed such as when dividing non-commutative numbers or when returning the matrix representation of an Octonion number — the value is either 'l' or 'r'.


⎕LR←'l' sets the Left/Right Direction Choice to Left
⎕LR←'r' sets the Left/Right Direction Choice to Right 
      a←<⍳4
      b←<⌽⍳4
      ⎕LR←'l' ⋄ a÷b
0.66667i0j0.66667k0.33333 
      ⎕LR←'r' ⋄ a÷b
0.66667i0.33333j0k0.66667

This setting may be localized to an individual function via the Variant operator: 

      a÷⍠'l' b
0.66667i0j0.66667k0.33333 
      a÷⍠'r' b
0.66667i0.33333j0k0.66667
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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