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https://github.com/sigmasternchen/gleam-community-maths
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Allow cartesian product of (a, b) instead of (a, a)
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2 changed files with 11 additions and 4 deletions
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@ -652,10 +652,10 @@ fn do_list_permutation_with_repetitions(
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/// </a>
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/// </div>
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///
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pub fn cartesian_product(xset: set.Set(a), yset: set.Set(a)) -> set.Set(#(a, a)) {
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pub fn cartesian_product(xset: set.Set(a), yset: set.Set(b)) -> set.Set(#(a, b)) {
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xset
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|> set.fold(set.new(), fn(accumulator0: set.Set(#(a, a)), member0: a) {
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set.fold(yset, accumulator0, fn(accumulator1: set.Set(#(a, a)), member1: a) {
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|> set.fold(set.new(), fn(accumulator0: set.Set(#(a, b)), member0: a) {
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set.fold(yset, accumulator0, fn(accumulator1: set.Set(#(a, b)), member1: b) {
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set.insert(accumulator1, #(member0, member1))
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})
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})
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@ -72,7 +72,7 @@ pub fn int_combination_test() {
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combinatorics.combination(7, 5, option.Some(combinatorics.WithRepetitions))
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|> should.equal(Ok(462))
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// NOTE: Tests with the 'combination' function that produce values that exceed
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// NOTE: Tests with the 'combination' function that produce values that exceed
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// precision of the JavaScript 'Number' primitive will result in errors
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}
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@ -697,4 +697,11 @@ pub fn example_test() {
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|> should.equal(
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set.from_list([#(1.0, 1.0), #(1.0, 2.0), #(10.0, 1.0), #(10.0, 2.0)]),
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)
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// Cartesian product of two sets with different types
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set.from_list(["1", "10"])
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|> combinatorics.cartesian_product(set.from_list([1.0, 2.0]))
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|> should.equal(
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set.from_list([#("1", 1.0), #("1", 2.0), #("10", 1.0), #("10", 2.0)]),
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)
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}
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