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1 | // Allows to vary the order by supplying a seed |
2 | // |
3 | // We add the seed to every LSFR value generated, and also start |
4 | // the LSFR with the seed. |
5 | |
6 | // Not 100% sure if this works, there was an endless loop once |
7 | |
8 | sclass WeightlessShuffledIteratorWithSeed<A> extends WeightlessShuffledIterator<A> {
|
9 | final int offset; |
10 | |
11 | // initialize only with a length (and a pseudo-list) |
12 | // if you are going to be calling nextIndex() instead of next() |
13 | *(int n) {
|
14 | this((L) iotaZeroList(n)); |
15 | } |
16 | |
17 | *(int n, int seed) {
|
18 | this((L) iotaZeroList(n), seed); |
19 | } |
20 | |
21 | *(L<A> list) {
|
22 | this(list, 0); |
23 | } |
24 | |
25 | *(L<A> list, int seed) {
|
26 | super(list); |
27 | if (n == 0) ret with offset = 0; |
28 | lsfr_start(seed); |
29 | offset = value-1; |
30 | } |
31 | |
32 | // copied from TripletLSFR.start |
33 | void lsfr_start(int seed) {
|
34 | value = mod_31bit(seed, cycleLength)+1; |
35 | } |
36 | |
37 | int postProcessLSFRValue(int i) {
|
38 | i += offset; |
39 | ret i >= cycleLength ? i-cycleLength : i; |
40 | } |
41 | } |
Began life as a copy of #1035206
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| Snippet ID: | #1035207 |
| Snippet name: | WeightlessShuffledIteratorWithSeed |
| Eternal ID of this version: | #1035207/22 |
| Text MD5: | 75e1a03cd9a68794e5df4083cdd65fd1 |
| Transpilation MD5: | 060a0a397b6ae576669c992dea9956b7 |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX fragment (include) |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2023-02-12 14:45:18 |
| Source code size: | 988 bytes / 41 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 140 / 314 |
| Version history: | 21 change(s) |
| Referenced in: | [show references] |