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allocation-free multiplication!
# Conflicts: # src/GroupRings.jl
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@ -301,14 +301,15 @@ end
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(+)(X::GroupRingElem, Y::GroupRingElem) = add(X,Y)
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(-)(X::GroupRingElem, Y::GroupRingElem) = add(X,-Y)
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function mul!{T<:Number}(X::AbstractVector{T}, Y::AbstractVector{T},
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pm::Array{Int,2}, result::AbstractVector{T})
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for (j,y) in enumerate(Y)
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if y != zero(eltype(Y))
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for (i, index) in enumerate(pm[:,j])
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if X[i] != zero(eltype(X))
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index == 0 && throw(ArgumentError("The product don't seem to belong to the span of basis!"))
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result[index] += X[i]*y
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function mul!{T}(result::AbstractVector{T}, X::AbstractVector, Y::AbstractVector, pm::Array{Int,2})
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z = zero(T)
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result .= z
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for j in eachindex(Y)
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if Y[j] != z
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for i in 1:size(pm,1)
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if X[i] != z
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pm[i,j] == 0 && throw(ArgumentError("The product don't seem to be supported on basis!"))
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result[pm[i,j]] += X[i]*Y[j]
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end
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end
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end
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