Implementing module, MethodError: objects of type Module are not callable

[nsajko]

I’ll go through some of the mistakes:

@hatmatrix

import Base

This isn’t necessary, don’t do it.

@hatmatrix

export NamedMatrix, getindex

Don’t export getindex, it’s not necessary and doesn’t do what you think it does.

@hatmatrix

mutable struct NamedMatrix

The mutable is almost surely not necessary (depending on what you want to do with the type).

@hatmatrix

    colnames::Vector{String}
    rownames::Vector{String}

The order of colnames and rownames isn’t consistent with the order you assume when you call the constructor. Swap them, for example.

@hatmatrix

Base.(:)

This is the reason for the “objects of type Module are not callable” error. Just do : instead.

@hatmatrix

NamedMatrix(x.matrix[i, j],
        x.rownames[i],        
        x.colnames[j])

Just do x.matrix[i, j], not sure what were you aiming for here.

Lastly, for performance reasons you probably want to keep the type of the variables i and j constant.