This is a result of the weird precedence of &. Try this: (df[:A] .== 1) & (df[:B] .== 1)
— John On May 16, 2014, at 8:25 AM, Jason Solack <[email protected]> wrote: > Hello all > > I'm trying to index a dataframe in the folowing manner: > > df = DataFrame(A = round(rand(1000) * 10), B = round(rand(1000) * 10)) > df[:C] = 0 > df[(df[:A] .== 1 & df[:B] .== 1),: C] = 1 > > > I get an error "ERROR: no method &(Int64, DataArray{Float64, 1}) > > if i index like this, it works but i won't be able to do "ors" > > df[(df[:A] .== 1 .* df[:B] .== 1),: C] = 1 > > is there another way of going about this? > > Thank you, > > Jason
