The part that's throwing the error is X[10], not the ( ).u = 3 part – you are trying to modify the .u field of a non-existent value.
On Mon, Sep 29, 2014 at 9:54 PM, Greg Plowman <[email protected]> wrote: > Hi, > > Just wanted further help or clarification on assigning to array of > user-defined structure. > > Question was asked on Stack Overflow ( *Uninitialized arrays in Julia* > <http://stackoverflow.com/questions/24416925/uninitialized-arrays-in-julia> > ) > > type struct > u::Int64 > v::Int64 > end > > X = Array(struct, 100) > X[10].u = 3 > > will generate this error > > > One answer states: > > You can assign values to uninitialized locations in arrays. You just can't > extract values from uninitialized locations. > > > > However when I run this code (Julia v0.3.0), I get an error: > > ERROR: access to undefined reference > in getindex at array.jl:246 > > I thought "X[10].u = 3" is assigning, not extracting? So why the error? > > Thanks, Greg > > > >
