System Variable FC: Difference between revisions

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<h1>{quad}FC - DEFINITION NEEDED</h1>
<h1><aplxx>⎕FC</aplxx> - Format Control</h1>
{{BoxStart|⎕FC
{{BoxStart|<apll>Z←⎕FC</apll>
| DEFINITION NEEDED}}
| returns the current value of the Format Control vector.}}
{{BoxEnd|⎕FC←'<i>VALUE</i>'}}
{{BoxEnd|<apll>Z</apll> is a character vector whose elements each control a separate aspect of how numeric output is formatted by the system.}}
<br />
{| border="1" cellpadding="5" cellspacing="0" rules="none" summary=""
|| <apll>⎕FC←R</apll> ||  sets all of the values of the Format Control Vector to <apll>R</apll>.
|-
| valign="top" |<apll>⎕FC←⍬</apll> || sets all of the values of the Format Control vector to their system default state.
|-
|| <apll>⎕FC[L]←R</apll> || sets the value(s) of the Format Control vector indexed by <apll>L</apll> to <apll>R</apll>.
|-
|}
<br />


Description here - to do
The first seven elements of <apll>⎕FC</apll> control the raw output of numeric display as well as the monadic and dyadic forms of the Format function (<apll>⍕</apll>).
 
{| border="1" cellpadding="5" rules="all" summary=""
||'''Index'''||'''Name'''||'''Default<br />Value'''
|-
|align="center"|[1]||Decimal Point Separator||<apll>'.'</apll>
|-
|align="center"|[2]||Thousands Separator||<apll>','</apll>
|-
|align="center"|[3]||Format-by-example '8' Fill||<apll>'*'</apll>
|-
|align="center"|[4]||Format-by-example Overflow fill||<apll>'0'</apll>
|-
|align="center"|[5]||Blank Fill (not <apll>",.0123456789"</apll>)||<apll>'_'</apll>
|-
|align="center"|[6]||Negative Sign||<apll>'¯'</apll>
|-
|align="center"|[7]||Complex Number Display Separator (only <apll>"iJdhru"</apll>)||<apll>'J'</apll>
|-
|}
 
For example,
 
<apll><pre>
      f←{⎕FC[1⊃⍺]←2⊃⍺ ⋄ ⍕⍵}
      (1 6) ':-' f ¯23.2
-23:2
      (1 6 7) ':-d' f ¯23.2<_i/>0
23:2<_ad/>180:0
      7 'i' f ¯2<_i/>3
¯2<_i/>3
      7 'J' f ¯2<_i/>3
¯2<_J/>3
      7 'd' f ¯2<_i/>3
3.605551275<_ad/>123.7
      7 'h' f ¯2<_i/>3
3.605551275<_ah/>0.3436
      7 'r' f ¯2<_i/>3
3.605551275<_ar/>2.159
      7 'u' f ¯2<_i/>3
3.605551275<_au/>0.3436
</pre></apll>
 
At the moment because Format-By-Example (<apll>L⍕R</apll> for Character Vector <apll>L</apll>) is not implemented in NARS2000, <apll>⎕FC[3]</apll> is not referenced.
 
Because the system function <apll>⎕FMT</apll> has its own Symbol Substitution mechanism, it is not sensitive to the settings in <apll>⎕FC</apll>.


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Latest revision as of 18:44, 13 August 2019

⎕FC - Format Control

Z←⎕FC returns the current value of the Format Control vector.
Z is a character vector whose elements each control a separate aspect of how numeric output is formatted by the system.


⎕FC←R sets all of the values of the Format Control Vector to R.
⎕FC←⍬ sets all of the values of the Format Control vector to their system default state.
⎕FC[L]←R sets the value(s) of the Format Control vector indexed by L to R.


The first seven elements of ⎕FC control the raw output of numeric display as well as the monadic and dyadic forms of the Format function (⍕).

Index Name Default
Value
[1] Decimal Point Separator '.'
[2] Thousands Separator ','
[3] Format-by-example '8' Fill '*'
[4] Format-by-example Overflow fill '0'
[5] Blank Fill (not ",.0123456789") '_'
[6] Negative Sign '¯'
[7] Complex Number Display Separator (only "iJdhru") 'J'

For example, 

      f←{⎕FC[1⊃⍺]←2⊃⍺ ⋄ ⍕⍵}
      (1 6) ':-' f ¯23.2
-23:2
      (1 6 7) ':-d' f ¯23.2i0
23:2ad180:0
      7 'i' f ¯2i3
¯2i3
      7 'J' f ¯2i3
¯2J3
      7 'd' f ¯2i3
3.605551275ad123.7
      7 'h' f ¯2i3
3.605551275ah0.3436
      7 'r' f ¯2i3
3.605551275ar2.159
      7 'u' f ¯2i3
3.605551275au0.3436

At the moment because Format-By-Example (L⍕R for Character Vector L) is not implemented in NARS2000, ⎕FC[3] is not referenced.

Because the system function ⎕FMT has its own Symbol Substitution mechanism, it is not sensitive to the settings in ⎕FC.

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
Alt+Shift ⍪ ≡ ≢ ⍒ ⍋ ⌽ ⍉ ⊖ ⍟ ⍱ ⍲ ⍠ ⌹
Alt ⋄ ¨ ¯ < ≤ ∅ ≥ > ≠ ∨ ∧ × ÷
Shift ~ ! @ # $ % ^ & * ( ) _ +
Key ` 1 2 3 4 5 6 7 8 9 0 - =
Alt+Shift ⍷ √ ⍨ ⍸ ⍥ ⍣ ⍞ ⍬ ⊣
Alt ? ⍵ ∊ ⍴ § ↑ ↓ ⍳ ○ π ← → ⊢
Shift Q W E R T Y U I O P { } |
Key q w e r t y u i o p [ ] \
Alt+Shift ∫ ∂ ⌻ ⍢ ⍙ ⍤ ⍫ ⌷
Alt ⍺ ⌈ ⌊ ∞ ∇ ∆ ∘ ‼ ⎕ ⍎ ⍕
Shift A S D F G H J K L : "
Key a s d f g h j k l ; '
Alt+Shift ⊆ ⊇ χ ⍡ ⍭ ⊙
Alt ⊂ ⊃ ∩ ∪ ⊥ ⊤ ⍦ ⍝ ⍀ ⌿
Shift Z X C V B N M < > ?
Key z x c v b n m , . /
NARS 2000 Lang
Tool
Bar 		← → + - × ÷ * ⍟ ⌹ ○ ! ? √ | ⌈ ⌊ ⊥ ⊤ ⊣ ⊢
≡ ≢ < ≤ = ≥ > ≠ ∨ ∧ ⍱ ⍲ ↑ ↓ ⊂ ⊃ ⌷ ⍋ ⍒
⍳ ∊ ⍸ ⍷ ∪ ∩ ⊆ ⊇ ~ § π .. , ⍪ ⍴ ⌽ ⊖ ⍉
/ \ ⌿ ⍀ ⊙ ¨ ⍨ ⍤ ⍣ ⍡ ⍥ ⍦ . ∘ ⍠ ‼ ⌻ ∂ ∫ ⍞ ⎕ ⍎ ⍕
⋄ ⍝ ∇ ∆ ⍙ _ ⍺ ⍵ ¯ ⍬ ∞ ∅
Second Row i j k i j k l g p r v x

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