7/8/2023 0 Comments Arrays with chipmunk basic![]() However, if customerTover is very large, and we do not have much workspace left, the above expression may easily cause a WS FULL error. No problem, that’s just (+/¨+⌿¨customerTover)÷52. Our task is to calculate the total average turnover per week per customer. Suppose that we have a huge list customerTover, of turnover amounts, one item per customer (we have more than 5,000 of them!).Įach item contains a matrix having a varying number of rows (products) and 52 columns (weeks). When used inappropriately, the each operator can sometimes use a large amount of memory for its intermediate results, so you may need to use it with some care. Therefore, our Process function can only work when the argument ⍵ has depth ¯2!īecause the town name and the country name are character vectors, but the population and the turnover are numeric scalars, meaning that ⍵ has heterogeneous depth: The depth is positive if the array is uniform (all of its items have the same depth), and negative if it is not. The depth of any other array is equal to the depth of its deepest item plus 1 and The depth of a non-scalar, simple array is 1 We call such an array a simple array, so we can instead say: The depth of any other array of any shape is 1, if all of its items are simple scalars. Here is a set of rules that define how to determine the depth of an array: It is represented by the monadic use of the symbol ≡. To help distinguish between simple and nested arrays, APL provides a function named depth. We need additional information: specifically, is it a simple or a nested array? This trivial example shows that when nested arrays are involved, it is not sufficient to rely on the shape of an array Strand notation avoids the use of enclose, because of the conventions used to separate individual items from one another. The same for disclose Īll items of an array are effectively scalars, whether they are simple scalars or enclosed arrays: their rank is 0, and their shape is empty Ī single item can be replaced only by another single item: a simple scalar, or an array of values zipped up using enclose (to form an enclosed array) and Nested array is an array in which at least one of the items is an enclosed array.Įnclose does nothing to a simple scalar - it returns the scalar unchanged. Item refers to a scalar that is a constituent of an array, whether it is a simple scalar or an enclosed array and Simple scalar refers to a single number or letter (rank zero) Įnclosed array refers to a scalar that is the result of enclosing anything other than a simple scalar ![]() When appropriate, we shall use four different terms: We know that the result of enclose is always a scalar, but there is a difference between enclosing a scalar number or character, and enclosing any other array. ![]() Compatibility and Migration Levelġ0.16.2. Simple Boolean Vector Left Argumentġ0.16.1. Mix Applied to Heterogeneous Dataġ0.12.1.1.
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