kalmar/GroupRings.jl
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doc strings for mul!s

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kalmar 2017-07-19 23:00:44 +02:00
parent d80cee5df5
commit afac7de06d
1 changed files with 25 additions and 0 deletions
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src/GroupRings.jl
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@ -321,6 +321,20 @@ end
(+)(X::GroupRingElem, Y::GroupRingElem) = add(X,Y)
(-)(X::GroupRingElem, Y::GroupRingElem) = add(X,-Y)
doc"""
mul!{T}(result::AbstractArray{T},
X::AbstractVector,
Y::AbstractVector,
pm::Array{Int,2})
> The most specialised multiplication for `X` and `Y` (`coeffs` of
> `GroupRingElems`) using multiplication table `pm`.
> Notes:
> * this method will silently produce false results if `X[k]` is non-zero for
> `k > size(pm,1)`.
> * This method will fail if any zeros (i.e. uninitialised entries) are present
> in `pm`.
> * Use with extreme care!
"""
function mul!{T}(result::AbstractVector{T},
X::AbstractVector,
Y::AbstractVector,
@ -339,6 +353,17 @@ function mul!{T}(result::AbstractVector{T},
end
end
doc"""
mul!{T}(result::GroupRingElem{T},
X::GroupRingElem,
Y::GroupRingElem)
> In-place multiplication for `GroupRingElem`s `X` and `Y`.
> `mul!` will make use the initialised entries of `pm` attribute of
> `parent(X)::GroupRing` (if available), and will compute and store in `pm` the
> remaining products.
> The method will fail with `KeyError` if product `X*Y` is not supported on
> `parent(X).basis`.
"""
function mul!{T}(result::GroupRingElem{T}, X::GroupRingElem, Y::GroupRingElem)
if result === X
result = deepcopy(result)