ydash = [1 => y[1]] creates a Dict that maps for from Int64 to Float64, `=>` is used for declaring Dict literals in Julia. c.f.: http://docs.julialang.org/en/l

ydash = [1 => y[1]] creates a Dict that maps for from Int64 to Float64, `=>` is used for declaring Dict literals in Julia. c.f.: http://docs.julialang.org/en/latest/stdlib/base/?highlight=dict#associative-collections http://docs.julialang.org/en/latest/stdlib/base/?highlight=d...