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| 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>.}}

<h1>{quad}ELX - Error Latent Expression</h1> | Set action to take on error}}

<h1><aplxx>⎕EM</aplxx> - Error Message</h1> |Return the value of the current error message|}}

''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>

<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.

==Dyadic Function== ...guments. The left string(L) is executed when the interpreter encounters an error executing the right argument(R).

== Chapter 6: "Writing a Function" == == Chapter 14: "Error Handling" ==

<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}.

...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

<apll>⎕SI</apll> is a niladic system function which returns a character matrix of the functions and their line numbers cu SYNTAX ERROR

==Monadic Function== 0 = Error<br>

...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

...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]]

...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]]

...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>

|| <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).

<h1>Quad FX - FIX or Function eXecute - '''⎕FX''' &nbsp; &nbsp; System Function</h1> ==Monadic Function==

...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.

...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/>

* [[Error codes]] * [[System Commands]] - also known as hook commands, these commands begin with <apll>)

...apll>, etc, are arbitrary functions of any type: primitive, user-defined, system, anonymous, and/or derived.</td> ...above descriptions. Very nicely, they fit into and extend the spectrum of function definition syntax from user-defined to dynamic to trains to operator expres

...apll> is a numeric scalar, vector or matrix; otherwise signal a <apll>RANK ERROR</apll>.</td> <p>For variations on this function, see the [[Variant#Eigenvalues_and_Eigenvectors|Variant Operator]].</p>

...for a dyadic or ambivalent function or for a dyadic or ambivalent derived function from an operator/hyperator.<br /> ...lt is all <apll>0</apll>. All times are in UTC and represent the time the function was last modified.

...ach name) or anappropriate length vector argument. Upon invocation of the function/operator/hyperator, these values are assigned one item per name.</p> <p>For example, a function whose header looks like</p>

...tended APL Standard in that they replace error-producing behavior with non-error-producing behavior. Note that Extended APL Standard wants you to know that ...tor dieresis-jot]] (<apll><i>f</i>⍤[X] Y</apll>) (rank) is used to apply a function to (monadic) or between (dyadic) cells of the argument(s).

...s a model example for '''returning a nested vector to APL''' from a System Function call. Remember per your technical knowledge of APL: '''[[System_Function_E ...ector result''' of the call to <'''qf_ec.c'''>, specifically, from monadic function '''SysFnMonEC_EM_YY'''. '''lpYYRes''' also contains a pointer to an object

...vg←{(+⌿⍵)÷≢⍵}</apll>, and named or unnamed may be used in place of any APL function (primitive, operator operand, hyperator hyperand, derived, train, user-defi == Function Arguments ==

SysVarValid:5, // 000F8000: Index to validation routine for System Vars (see SYS_VARS) UsrDfn:1, // 00100000: User-defined function/operator/hyperator

<big>'''NARS2000 Creating New Quad System Functions'''</big> ...The basic premise is that '''you''' have an idea for a '''new Quad system function''' command for APL/NARS and wish to implement it, add it to NARS functional

This function is available in both ''monadic'' and ''dyadic'' forms. ==Monadic Function==

...> is the [https://en.wikipedia.org/wiki/Riemann_zeta_function Riemann Zeta function].</td> The number to the left of the <apll><_b/></apll> is the base of the number system for the characters to the right of the <apll><pn>b</pn></apll>. The base m

...mdash; <apll>¯128</apll> to <apll>127</apll>); if not, then a <apll>DOMAIN ERROR</apll> is signalled.</p> ...nnot be truncated at the high end without losing data, then a <apll>DOMAIN ERROR</apll> is signalled. For example, if the data in <apll>L</apll> is charact

This statement exits the current function and is equivalent to <apll>→0</apll>. ...apll>:select</apll> statement's expression. The comparison uses the Match function (≡), so it takes into account rank and shape at every level.

To demonstrate with an extreme example, consider the following function: ...Contract''', and separated into its constituent parts with a new primitive function '''Distract'''.