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• Dot
  SYNTAX ERROR
  3 KB (322 words) - 22:12, 10 September 2022
• Frame agreement
  RANK ERROR assert←{0≡⍵:'error: no common frame prefix' ⎕SIGNAL 4 ⋄ ⍵}
  7 KB (779 words) - 14:23, 26 August 2023
• Lang5
  ...It allows simplistic yet effective type checking in Lang5, allowing early error prevention.
  3 KB (361 words) - 22:46, 24 January 2024
• Constant
  VALUE ERROR
  3 KB (379 words) - 22:15, 10 September 2022
• Index origin
  ...ight lang=apl inline>⎕IO</syntaxhighlight> typically results in a [[DOMAIN ERROR]].
  4 KB (518 words) - 22:05, 10 September 2022
• APL Farm
  * Off-topic (named "Index Error" on Matrix)
  3 KB (393 words) - 12:53, 31 August 2023
• Overstrike
  ...kes were allowed for the odd case where one was correcting a typographical error. For example, <syntaxhighlight lang=apl inline>F</syntaxhighlight> and <syn
  14 KB (1,453 words) - 22:10, 10 September 2022
• WPF XAML demo
  ⍝ Fixing the XAML did not work. Show an error and exit. ⎕ ← 'Error Fixing XAML'
  32 KB (4,251 words) - 13:13, 4 March 2024
• Range
  ...ntaxhighlight lang=apl inline>⍬</syntaxhighlight> or even throw a [[DOMAIN ERROR]] for <syntaxhighlight lang=apl inline>X…Y</syntaxhighlight> when <syntax
  3 KB (282 words) - 22:18, 10 September 2022
• Matrix Divide
  ⎕CT>|Y+.×X-Y×X⌹Y ⍝ ∧ is orthogonal to Y (with negligible error)
  4 KB (453 words) - 01:40, 18 March 2024
• Subtract
  In the absense of rounding error we have <syntaxhighlight lang=apl inline>-/v</syntaxhighlight> {{←→}} <
  4 KB (452 words) - 10:58, 11 September 2022
• Index Of
  ...ht lang=apl inline>(1↓⍴X)≡(1-≢⍴X)↑⍴Y</syntaxhighlight>; otherwise [[LENGTH ERROR]] is raised. J simply treats them as not found.
  4 KB (556 words) - 21:35, 10 September 2022
• GNU APL
  ...which are more commonly used by other dialects. This can lead to [[SYNTAX ERROR]]s if attempting to use code written for GNU APL in other implementations.
  4 KB (565 words) - 12:28, 22 February 2024
• Type
  ...and classes with constructors but no niladic constructor, cause a [[NONCE ERROR]].
  5 KB (491 words) - 14:28, 13 February 2023
• Function
  ...lly or dyadically. However, one or both of these cases may give a [[SYNTAX ERROR]] regardless of the argument. In this case the function is called
  5 KB (735 words) - 22:19, 10 September 2022
• Unicode
  ...hing into one APL system, copy it to another and are greeted by a [[SYNTAX ERROR]] or the like. ...in a PDF file. Blindly copying them into an APL [[session]] can produce an error which might well confuse the user.
  14 KB (1,837 words) - 13:03, 5 February 2024
• Inner Product
  ...ust match with number of rows in the right array, otherwise we will get an error. LENGTH ERROR
  13 KB (1,585 words) - 00:19, 10 March 2024
• Take
  ...of the right argument to be unchanged. In [[ngn/apl]], it simply causes an error. ...models Take as defined by [[Dyalog APL]] but with no axis specification or error checking. It is implemented by construction a [[nested array]] of indices a
  13 KB (1,829 words) - 01:23, 2 March 2024
• Find
  ...s prepended with ones. If the left argument has higher rank, Find does not error, but it is never found in the right argument (resulting in an all-zero arra
  5 KB (595 words) - 21:36, 10 September 2022
• Function-operator overloading
  ...unctions will cause overloading resolution to fail, resulting in a valence error.
  6 KB (797 words) - 12:53, 13 February 2024

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