I have the following array (here is vector), and I want to return the index of “8” element, which should be 4 as integer not CartesianIndex. Any solution?

julia> s=[5 6 7 8] 1×4 Matrix{Int64}: 5 6 7 8 julia> findall(isequal(8), s) 1-element Vector{CartesianIndex{2}}: CartesianIndex(1, 4)

It looked like this.

In general, you can use LinearIndices to map from cartesian to linear indexing:

LinearIndices

s = [5 6 7 8] inds = findall(isequal(8), s) li = LinearIndices(s) li[inds]

Note that the find family of functions return linear indices for input vectors:

find

v = [5, 6, 7, 8] findall(isequal(8), v)