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add implementation comment for ribbon #13011

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add implementation comment for ribbon #13011

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18 changes: 18 additions & 0 deletions util/ribbon_alg.h
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,24 @@ namespace ribbon {
// out the leading 1s, so starts (at least) one column later and only
// needs (at most) r - 1 coefficients.
//
// For implementation, the content of matrix is more like a lower-triangular
// matrix as follows, but the "start column" counts bottom up, so it also fits
// the upper-triangular solution mentioned above.
//
// [100000000000000000000000] start: m - 1
// [#10000000000000000000000] start: m - 2
// ...
// [00000000000###1000000000] start: 9
// [000000000000###100000000] start: 8
// [0000000000000###10000000] start: 7
// [000000000000000000000000] start: 6
// [000000000000000###100000] start: 5
// [000000000000000000000000] start: 4
// [00000000000000000###1000] start: 3
// [000000000000000000000000] start: 2
// [0000000000000000000###10] start: 1
// [00000000000000000000###1] start: 0
//
// ######################################################################
// ###################### Ribbon PHSF scalability #######################
//
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