sumcacrossstartswithval

Sumcacrossstartswithval is a term used in programming discussions to describe a composite data-processing operation that combines summation, Cartesian product, and a starts-with filter. It is not a standard mathematical function; its precise form varies by language and library. In general, sumcacrossstartswithval denotes a workflow that takes two input sequences and returns a single numeric result by summing a pairwise value over a filtered subset of their Cartesian product.

Typically, the inputs are two sequences, A and B, a string prefix, a value val, and a binary summand function f. The operation forms the Cartesian product A × B, filters pairs (a,b) whose string representations meet a starts-with predicate relative to prefix, and computes the sum of f(a,b) across those pairs. The parameter val may be included in f or used to adjust the filter, depending on implementation.

Variants and semantics vary. Some implementations apply the predicate on the first element only; others allow either element, or require a different criterion for the pair. The summand function f can incorporate val directly (for example, f(a,b) = base(a,b) + val) or use val in a separate weighting or threshold role. The name encodes the core steps: sum, ca (Cartesian product), cross, startswith, and val.

Example (pseudo-code): result = sum over (a in A, b in B) of f(a,b) for which toString(a).startsWith(prefix) is true, with f(a,b) defined as base(a,b) + val.

Used in data analysis, combinatorial tasks, and some puzzle contexts, the exact meaning of sumcacrossstartswithval should be confirmed from source documentation when encountered. See also Cartesian product, filtering, summation, map-reduce.