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A '''LIMIT ERROR''' is an [[error message]] indicating that some imposed limit of the interpreter (one that is due to resource or design rather than theoretical limitations) has prevented an operation from completing. Common cases are that a program attempted to create an array whose [[rank]] exceeds the [[maximum rank]] or whose length along one [[axis]] would exceed the maximum allowed length. In [[Dyalog APL]], the maximum rank is 15, so taking an [[Outer Product]] of two rank-8 arrays fails: | A '''LIMIT ERROR''' is an [[error message]] indicating that some imposed limit of the interpreter (one that is due to resource or design rather than theoretical limitations) has prevented an operation from completing. Common cases are that a program attempted to create an array whose [[rank]] exceeds the [[maximum rank]] or whose length along one [[axis]] would exceed the maximum allowed length. In [[Dyalog APL]], the maximum rank is 15, so taking an [[Outer Product]] of two rank-8 arrays fails: | ||
< | <syntaxhighlight lang=apl> | ||
((8⍴1)⍴2) ∘.+ ((8⍴1)⍴3) | ((8⍴1)⍴2) ∘.+ ((8⍴1)⍴3) | ||
LIMIT ERROR: Rank of resultant array would exceed maximum permitted | LIMIT ERROR: Rank of resultant array would exceed maximum permitted | ||
((8⍴1)⍴2)∘.+((8⍴1)⍴3) | ((8⍴1)⍴2)∘.+((8⍴1)⍴3) | ||
∧ | ∧ | ||
</ | </syntaxhighlight> | ||
{{Works in|[[Dyalog APL]]}} | {{Works in|[[Dyalog APL]]}} | ||
In a 64-bit interpreter, it is rare to run into an array length limit, since the maximum allowed length is usually on the order of < | In a 64-bit interpreter, it is rare to run into an array length limit, since the maximum allowed length is usually on the order of <syntaxhighlight lang=apl inline>2*64</syntaxhighlight>, and attempting to create an array this large may run into a [[DOMAIN ERROR]] or [[WS FULL]], as most machines do not have enough addressable memory to store it. [[Empty]] arrays do not need storage space, so working with arrays with one length-0 axis and one long axis can sometimes reveal a LIMIT ERROR: | ||
< | <syntaxhighlight lang=apl> | ||
((0,2*63)⍴2) , ((0,2*63)⍴3) | ((0,2*63)⍴2) , ((0,2*63)⍴3) | ||
LIMIT ERROR | LIMIT ERROR | ||
((0,2*63)⍴2),((0,2*63)⍴3) | ((0,2*63)⍴2),((0,2*63)⍴3) | ||
∧ | ∧ | ||
</ | </syntaxhighlight> | ||
{{Works in|[[Dyalog APL]]}} | {{Works in|[[Dyalog APL]]}} | ||
LIMIT ERRORs may appear when working with components outside of APL such as files. Operating system limitations are usually reported as LIMIT ERRORs, since they are caused by constraints outside of the APL interpreter's control. | LIMIT ERRORs may appear when working with components outside of APL such as files. Operating system limitations are usually reported as LIMIT ERRORs, since they are caused by constraints outside of the APL interpreter's control. | ||
{{APL features}} | {{APL features}}[[Category:Errors]] | ||