Wrong names in setindex-functions

[solliolli]

The setindex-functions for probability and utility matrices throw an error if a non-existent state is given, but all the functions have probability_matrix.nodes[i] when it should be PM or UM, depending on the function.

• Probability matrices:

  DecisionProgramming.jl/src/influence_diagram.jl

  Lines 570 to 599 in d31a527

  	function Base.setindex!(PM::ProbabilityMatrix, p::T, I::Vararg{Union{String, Int},N}) where {N, T<:Real}
  	I2 = []
  	for i in 1:N
  	if isa(I[i], String)
  	if get(PM.indices[i], I[i], 0) == 0
  	throw(DomainError("Node $(probability_matrix.nodes[i]) does not have state $(I[i])."))
  	end
  	push!(I2, PM.indices[i][I[i]])
  	else
  	push!(I2, I[i])
  	end
  	end
  	PM.matrix[I2...] = p
  	end
  	function Base.setindex!(PM::ProbabilityMatrix{N}, P::Array{T}, I::Vararg{Union{String, Int, Colon}, N}) where {N, T<:Real}
  	I2 = []
  	for i in 1:N
  	if isa(I[i], Colon)
  	push!(I2, :)
  	elseif isa(I[i], String)
  	if get(PM.indices[i], I[i], 0) == 0
  	throw(DomainError("Node $(probability_matrix.nodes[i]) does not have state $(I[i])."))
  	end
  	push!(I2, PM.indices[i][I[i]])
  	else
  	push!(I2, I[i])
  	end
  	end
  	PM.matrix[I2...] = P
  	end

• Utility matrices:

  DecisionProgramming.jl/src/influence_diagram.jl

  Lines 706 to 735 in d31a527

  	function Base.setindex!(UM::UtilityMatrix{N}, y::T, I::Vararg{Union{String, Int},N}) where {N, T<:Real}
  	I2 = []
  	for i in 1:N
  	if isa(I[i], String)
  	if get(UM.indices[i], I[i], 0) == 0
  	throw(DomainError("Node $(probability_matrix.nodes[i]) does not have state $(I[i])."))
  	end
  	push!(I2, UM.indices[i][I[i]])
  	else
  	push!(I2, I[i])
  	end
  	end
  	UM.matrix[I2...] = y
  	end
  	function Base.setindex!(UM::UtilityMatrix{N}, Y::Array{T}, I::Vararg{Union{String, Int, Colon}, N}) where {N, T<:Real}
  	I2 = []
  	for i in 1:N
  	if isa(I[i], Colon)
  	push!(I2, :)
  	elseif isa(I[i], String)
  	if get(UM.indices[i], I[i], 0) == 0
  	throw(DomainError("Node $(probability_matrix.nodes[i]) does not have state $(I[i])."))
  	end
  	push!(I2, UM.indices[i][I[i]])
  	else
  	push!(I2, I[i])
  	end
  	end
  	UM.matrix[I2...] = Y
  	end

[solliolli]

I'm planning to make a pull request when I have more time, but in case I forget, this is a pretty good first issue for someone.