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Slightly faster algebra multiplication

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kalmar 2017-03-13 10:28:49 +01:00
parent a696205d6e
commit 48645a7b5c
1 changed files with 5 additions and 5 deletions
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10
GroupAlgebras.jl
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@ -61,12 +61,12 @@ end
function algebra_multiplication{T<:Number}(X::AbstractVector{T}, Y::AbstractVector{T}, pm::Array{Int,2})
result = zeros(X)
for (i,x) in enumerate(X)
if x != 0
for (j, index) in enumerate(pm[i,:])
if Y[j] != 0
for (j,y) in enumerate(Y)
if y != zero(T)
for (i, index) in enumerate(pm[:,j])
if X[i] != zero(T)
index == 0 && throw(ArgumentError("The product don't seem to belong to the span of basis!"))
result[index] += x*Y[j]
result[index] += X[i]*y
end
end
end