Array model: Difference between revisions

Array model (view source)

489 bytes added , 13:41, 18 October 2019

Anonymous user

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 == Array characteristics ==
+APL defines the following characteristics of an array. All information about an array is contained in two [[Vector|vectors]]: its [[shape]] and [[ravel]], including, for empty arrays, the ravel's [[prototype]].
+* The [[rank]] is the number of dimensions or [[axes]] it has. It is the length of the shape.
+* The [[shape]] gives its length along each dimension.
+* The [[bound]] is the total number of elements in an array, that is, the product of the shape.
+* The [[ravel]] is a [[vector]] containing all of the array's [[Element|elements]]. It's length is the bound.
+* The [[Array prototype|prototype]] is a special "null" element for the array. It is derived from the first element for non-empty arrays.
+* The [[depth]] is a number indicating how deeply nested an array is.
 === Depth ===
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 APLs vary in their definition of depth: for example some may return the depth with a sign to indicate that some level of the array mixes elements of different depths.
-=== Rank ===
-{{Main|Rank}}
-The concept of rank is very important in APL, and isn't present in many other languages. It refers to the number of dimensions in the array. So far, rank-0 arrays are scalars, rank-1 arrays are vectors, rank-2 arrays are usually called matrices or tables.
 == External links ==