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Faster SwapMatrixRows and SwapMatrixColumns for 8bit matrices #5838

Merged
merged 1 commit into from
Nov 13, 2024
Merged

Faster SwapMatrixRows and SwapMatrixColumns for 8bit matrices #5838

merged 1 commit into from
Nov 13, 2024

Commits on Nov 11, 2024

  1. Fast SwapMatrixRows/columns for 8bit matrices 

    Before:

    gap> mat:=IdentityMat(10,GF(5));; ConvertToMatrixRep(mat);; mat;
    < mutable compressed matrix 10x10 over GF(5) >
    gap> for i in [1..1000000] do SwapMatrixColumns(mat,1,2); od; time;
    1308
    gap> for i in [1..1000000] do SwapMatrixRows(mat,1,2); od; time;
    125
    gap> for i in [1..1000000] do tmp:=mat[1];mat[1]:=mat[2];mat[2]:=tmp; od; time;
    92

After:

    gap> mat:=IdentityMat(10,GF(5));; ConvertToMatrixRep(mat);; mat;
    < mutable compressed matrix 10x10 over GF(5) >
    gap> for i in [1..1000000] do SwapMatrixColumns(mat,1,2); od; time;
    198
    gap> for i in [1..1000000] do SwapMatrixRows(mat,1,2); od; time;
    28
    gap> for i in [1..1000000] do tmp:=mat[1];mat[1]:=mat[2];mat[2]:=tmp; od; time;
    92
    @fingolfin
    fingolfin committed Nov 11, 2024
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