kalmar/GroupRings.jl
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totally pm-free multiplication!

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kalmar 2017-07-25 14:44:37 +02:00
parent 147cd053e3
commit 3e7fed4e41
1 changed files with 22 additions and 11 deletions
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19
src/GroupRings.jl
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@ -365,23 +365,34 @@ function mul!{T}(result::GroupRingElem{T}, X::GroupRingElem, Y::GroupRingElem)
RG = parent(X)
if isdefined(RG, :pm)
s = size(RG.pm)
for j::Int in eachindex(Y.coeffs)
for j::Int in 1:length(Y.coeffs)
if Y.coeffs[j] != z
j <= s[2] || throw("Element in Y outside of support of RG.pm")
for i::Int in eachindex(X.coeffs)
for i::Int in 1:length(X.coeffs)
if X.coeffs[i] != z
i <= s[1] || throw("Element in X outside of support of RG.pm")
if RG.pm[i,j] == 0
g::elem_type(parent(X).group) = RG.basis[i]*RG.basis[j]
RG.pm[i,j] = RG.basis_dict[g]
RG.pm[i,j] = RG.basis_dict[RG.basis[i]*RG.basis[j]]
end
result.coeffs[RG.pm[i,j]] += X[i]*Y[j]
end
end
end
end
else
for j::Int in 1:length(Y.coeffs)
if Y.coeffs[j] != z
for i::Int in 1:length(X.coeffs)
if X.coeffs[i] != z
result[RG.basis[i]*RG.basis[j]] += X[i]*Y[j]
end
end
end
end
end
return result
end