DeltaArrays.jl

This Julia library provides DeltaArray, an efficient N-dimensional Diagonal array type. If your array $A$ is of the form

$$ A = a_i \delta_{i \dots j} = \begin{cases} a_i, &\text{if} ~~ i=\dots=j \\ 0, &\text{otherwise} \end{cases} $$

then it can be represented by a DeltaArray.

For compatibility, DeltaArrays{T,2} should just behave like Diagonal{T}.