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add mul! and addeq! for MatrixSpace construction
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@ -1,7 +1,7 @@
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module GroupRings
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using Nemo
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import Nemo: Group, GroupElem, Ring, RingElem, parent, elem_type, parent_type
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import Nemo: Group, GroupElem, Ring, RingElem, parent, elem_type, parent_type, mul!, addeq!
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import Base: convert, show, hash, ==, +, -, *, //, /, length, norm, rationalize, deepcopy_internal, getindex, setindex!, eltype, one, zero
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@ -281,6 +281,13 @@ end
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#
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###############################################################################
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function addeq!{T}(X::GroupRingElem{T}, Y::GroupRingElem{T})
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parent(X) == parent(Y) || throw(ArgumentError(
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"Elements don't seem to belong to the same Group Ring!"))
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X.coeffs .+= Y.coeffs
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return X
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end
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function add{T<:Number}(X::GroupRingElem{T}, Y::GroupRingElem{T})
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parent(X) == parent(Y) || throw(ArgumentError(
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"Elements don't seem to belong to the same Group Ring!"))
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@ -298,7 +305,7 @@ 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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function mul!{T}(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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@ -312,6 +319,11 @@ function mul!{T<:Number}(X::AbstractVector{T}, Y::AbstractVector{T},
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end
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end
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function mul!(result::GroupRingElem, X::GroupRingElem, Y::GroupRingElem)
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mul!(X.coeffs, Y.coeffs, parent(X).pm, result.coeffs)
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return result
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end
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function mul{T<:Number}(X::AbstractVector{T}, Y::AbstractVector{T},
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pm::Array{Int,2})
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result = zeros(X)
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@ -321,8 +333,8 @@ end
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function mul(X::AbstractVector, Y::AbstractVector, pm::Array{Int,2})
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T = promote_type(eltype(X), eltype(Y))
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result = zeros(T, deepcopy(X))
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mul!(X, Y, pm, result)
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result = zeros(T, X)
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mul!(Vector{T}(X), Vector{T}(Y), pm, result)
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return result
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end
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