For avoiding unwanted conversions, DataFramesMeta has a PassThrough type with an alias P. You should be able to do:
mydf[1] = P(Array(mydf[1])) On Sep 14, 2016 5:17 PM, "Douglas Bates" <[email protected]> wrote: > Of course, this brings me back to another problem, which is replacing a > column of a dataframe with an Array without having the Array converted to a > DataArray or a NullableArray. I have a large CSV file in which over 99% of > the columns do not contain nulls. Because some of the columns contain > nulls I can't use CSV.read(..., nullable = false) but I do want to convert > those columns that do not contain nulls to Arrays. > > If I try to replace the column as > > mydf[1] = Array(mydf[1]) > > I get a DataArray in the release version of DataFrames. (I'm not sure > what happens in your nl/nullable branch). > > The way I avoid this is right now is by working with mydf.columns directly > but I always caution others not to work directly with fields of composite > types and I should probably follow my own advice. > > On Wednesday, September 14, 2016 at 4:07:21 PM UTC-5, Douglas Bates wrote: >> >> Thanks. I didn't try that because I thought that a NullableArray was an >> Array so that conversion would be a no-op. I should have tested it. >> >> On Wednesday, September 14, 2016 at 4:02:04 PM UTC-5, Milan Bouchet-Valat >> wrote: >>> >>> Le mercredi 14 septembre 2016 à 13:56 -0700, Douglas Bates a écrit : >>> > I remember someone (Milan?, Alex?) writing a short cal to convert a >>> > NullableArray to an Array but I can't seem to find it now. Can >>> > someone refresh my memory, please? >>> What do you mean exactly? This works AFAICT: >>> julia> convert(Array, NullableArray(1:3)) >>> 3-element Array{Int64,1}: >>> 1 >>> 2 >>> 3 >>> >>> >>> Regards >>> >> -- > You received this message because you are subscribed to the Google Groups > "julia-stats" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "julia-stats" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
