Unary Operators

UnaryOps are fairly straightforward $z = f(x)$ and their meaning should be clear from the name in most cases.

UnaryOps are used only in the map and apply functions.

julia> using SuiteSparseGraphBLAS
julia> x = GBVector([1.5, 0, pi])3x1 GraphBLAS double matrix, full by col
  3 entries, memory: 280 bytes

    (1,1)    1.5
    (2,1)    0
    (3,1)    3.14159
julia> y = map(sin, x)3x1 GraphBLAS double matrix, full by col
  3 entries, memory: 288 bytes

    (1,1)    0.997495
    (2,1)    0
    (3,1)    1.22465e-16
julia> map(asin, y)3x1 GraphBLAS double matrix, full by col
  3 entries, memory: 288 bytes

    (1,1)    1.5
    (2,1)    0
    (3,1)    1.22465e-16

Internally functions are lowered like this:

julia> using SuiteSparseGraphBLAS
julia> op = unaryop(sin, Float64)SuiteSparseGraphBLAS.TypedUnaryOperator{typeof(sin), Float64, Float64}(true, true, "GxB_SIN_FP64", Ptr{SuiteSparseGraphBLAS.LibGraphBLAS.GB_UnaryOp_opaque} @0x00007f2fa5c21380, sin, nothing)
julia> map(op, GBVector([1.5, 0, pi]))3x1 GraphBLAS double matrix, full by col
  3 entries, memory: 288 bytes

    (1,1)    0.997495
    (2,1)    0
    (3,1)    1.22465e-16

Built-Ins

The following functions are built into SuiteSparse:GraphBLAS. They are, much faster than arbitrary Julia functions and should be used when possible.

Unary functions unique to SuiteSparseGraphBLAS are:

rowindex(xᵢⱼ) -> i

colindex(xᵢⱼ) -> j