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• System Variable DM
  | Diagnostic Message set to last error message the APL interpreter encountered.}} ...interpreter sets its value when it encounters an error, e.g. <apll>DOMAIN ERROR</apll>.}}
  1 KB (187 words) - 18:05, 16 April 2018
• System Variable ELX
  <h1>{quad}ELX - Error Latent Expression</h1> | Set action to take on error}}
  974 bytes (158 words) - 23:11, 11 February 2015
• System Function EM
  <h1><aplxx>⎕EM</aplxx> - Error Message</h1> |Return the value of the current error message|}}
  924 bytes (138 words) - 16:20, 16 April 2018
• Examples/Files
  ''Example 1 - NARS2000 User APL Function'': '''FileSize''' &nbsp; &nbsp; Uses System Functions/Variables: '''⎕NTIE ⎕NSIZE ⎕NUNTIE ⎕ELX''' <br> ⎕ELX←"→ErrFileSiz" ⍝On error(e.g. file not found), goto ErrFileSiz line <br>
  2 KB (217 words) - 16:54, 26 January 2015
• System Function ES
  <h1>Quad ES - Event Simulate - '''⎕ES''' &nbsp; &nbsp; System Function</h1> ...(⎕EM) or Event Type(⎕ET)] - for debugging, user alerts, detailed at-length error messaging purposes.
  4 KB (541 words) - 23:28, 20 February 2015
• System Function EA
  ==Dyadic Function== ...guments. The left string(L) is executed when the interpreter encounters an error executing the right argument(R).
  2 KB (316 words) - 23:20, 11 February 2015
• APL Wiki Tutorial
  == Chapter 6: "Writing a Function" == == Chapter 14: "Error Handling" ==
  2 KB (285 words) - 05:40, 5 February 2015
• Del
  <h1> {del} &mdash; Edit User Function &mdash; Keystroke ALT+G &mdash; Character 8711 or x2211</h1> ...on, it is not actually used in the header or the body of the function. The system command )EDIT may be used interchangeably with {del}.
  3 KB (570 words) - 17:58, 24 November 2014
• System Command ERASE
  ...o arguments has no effect; to erase everything in the workspace, use the [[System Command Clear|)CLEAR]] command to start a fresh, clear workspace. function function2
  1 KB (160 words) - 20:22, 13 October 2019
• System Function SI
  <apll>⎕SI</apll> is a niladic system function which returns a character matrix of the functions and their line numbers cu SYNTAX ERROR
  2 KB (264 words) - 16:05, 16 April 2018
• System Function EC
  ==Monadic Function== 0 = Error<br>
  3 KB (489 words) - 00:15, 13 December 2017
• System Command SI
  ...cessing was suspended/halted/a break occurred - and is where you or an APL system programmer needs to most closely scrutinize or debug the APL coding. ...s a reminder of where you the APL programmer or an APL user encountered an error. )SI is saved when the workspace is )SAVE'd and is available for the next
  1 KB (208 words) - 20:35, 13 October 2019
• System Functions
  ...e may be assigned to a quad variable. A value cannot be assigned to a quad function.</noinclude> ! colspan="2" | [[System Functions|Niladic System Functions]]
  3 KB (392 words) - 02:02, 5 November 2023
• System Variables
  ...e may be assigned to a quad variable. A value cannot be assigned to a quad function.</noinclude> ! colspan="2" | [[Scalar System Variables|System Variables]]
  916 bytes (125 words) - 16:38, 28 April 2018
• System Labels
  ...as to distinguish them from normal labels. The following table lists the system labels defined so far and the special context in which they are used.</p> <td>is called when an inverse function is needed as in <apll>foo⍣¯1 R</apll>.</td>
  5 KB (651 words) - 00:53, 19 September 2022
• System Variable LX
  || <apll>⎕LX←'START'</apll> || Have the workspace execute function START when it is loaded via )LOAD or the '''<u>F</u>ile, <u>O</u>pen''' men | valign="top" |<apll>⎕LX←''</apll> || Do not have any function execute when the workspace is loaded (null string, this is the default).
  4 KB (718 words) - 18:09, 15 July 2015
• System Function FX
  <h1>Quad FX - FIX or Function eXecute - '''⎕FX''' &nbsp; &nbsp; System Function</h1> ==Monadic Function==
  4 KB (609 words) - 20:55, 3 June 2017
• System Variable FEATURE
  ...vector whose elements each control a separate experimental Feature of the system.}} ...←⍬</apll> || sets all of the values of the Feature Control vector to their system default state.
  5 KB (649 words) - 20:40, 12 January 2023
• Examples/Roman
  ...rs in APL, and is not necessarily the most efficient way to implement this function.<br/> ...p;&nbsp;&nbsp;⎕vr 'roman' {lamp} System function to list the contents of a function<br/>
  4 KB (524 words) - 12:12, 18 March 2013
• Main Page
  * [[Error codes]] * [[System Commands]] - also known as hook commands, these commands begin with <apll>)
  4 KB (507 words) - 12:05, 2 October 2022

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