eprmutate

nameeprmutate
created_at2023-12-19 17:37:44.788025
updated_at2023-12-19 19:44:02.642674
downloads59
descriptionPermutation Library
homepagehttps://github.com/schwidom/eprmutate
repository
max_upload_size
id1074505
Frank Schwidom

documentation

https://docs.rs/eprmutate

readme

# eprmutate Permutation library. Calculation of a permutation from a number and back: ```rust use eprmutate::permutation; use eprmutate::permutation_number; let p = permutation(u128::MAX); assert_eq!(permutation_number(&p), Some(u128::MAX)); // p doesn't know the number assert_eq!( p.v, [ 18, 13, 11, 8, 27, 16, 20, 22, 12, 24, 9, 1, 30, 3, 15, 23, 25, 2, 28, 19, 14, 29, 5, 10, 17, 31, 32, 26, 33, 0, 4, 6, 21, 34, 7 ]); ``` Permutating by number: ```rust use eprmutate::permutation; assert_eq!(permutation(0).v.as_slice(), [0]); assert_eq!(permutation(1).v.as_slice(), [1, 0]); assert_eq!(permutation(2).v.as_slice(), [0, 2, 1]); assert_eq!(permutation(3).v.as_slice(), [1, 2, 0]); assert_eq!(permutation(4).v.as_slice(), [2, 0, 1]); assert_eq!(permutation(5).v.as_slice(), [2, 1, 0]); assert_eq!(permutation(6).v.as_slice(), [0, 1, 3, 2]); ``` Initializing by a start number and continuing: ```rust use eprmutate::PermutationRemainder; let pr = PermutationRemainder::new( 7); assert_eq!( pr.permutation().v.as_slice(), [1, 0, 3, 2]); let pr = pr.next().unwrap(); assert_eq!( pr.permutation().v.as_slice(), [0, 2, 3, 1]); let pr = pr.next().unwrap(); assert_eq!( pr.permutation().v.as_slice(), [1, 2, 3, 0]); let pr = pr.next().unwrap(); assert_eq!( pr.permutation().v.as_slice(), [2, 0, 3, 1]); assert_eq!( 10, pr.permutation_number().unwrap()) ``` Managing a fixed length permutation ```rust use eprmutate::permutation; assert_eq!(permutation(0).fix_length(3).unwrap().as_slice(), [0, 1, 2]); assert_eq!(permutation(1).fix_length(3).unwrap().as_slice(), [1, 0, 2]); assert_eq!(permutation(2).fix_length(3).unwrap().as_slice(), [0, 2, 1]); assert_eq!(permutation(3).fix_length(3).unwrap().as_slice(), [1, 2, 0]); assert_eq!(permutation(4).fix_length(3).unwrap().as_slice(), [2, 0, 1]); assert_eq!(permutation(5).fix_length(3).unwrap().as_slice(), [2, 1, 0]); assert_eq!(permutation(6).fix_length(3), None); ```
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