Index Operators

An IndexUnaryOp is a unary operation which is able to access the location of an element as well as its value. They define predicates for use with the select! function as well as index access for apply!.

Built-Ins

Built-in IndexUnaryOpss can be found in the SelectOps submodule. However users should pass the equivalent Julia function when possible.

SuiteSparseGraphBLAS.IndexUnaryOps.diagindex — Function

diagindex(xᵢⱼ) -> (j - (i + y))

Dummy function for use in apply. Returns the column diagonal index of each element.

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SuiteSparseGraphBLAS.IndexUnaryOps.isindexop — Function

isindexop(op)::Bool

If isindexop(op) is true then apply will wrap op in IndexOp. op must have the signature f(x, i::Int64, j::Int64, y). This function is only called from apply.

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SuiteSparseGraphBLAS.IndexUnaryOps.IndexOp — Type

IndexOp{F}

Wrapper which indicates to apply that an operator has the signature: f(x, i::Int64, j::Int64, y) where x is the value at a particular index, i and j are the indices, and y is an auxiliary input.