I’d not really opposed to it, but I’m also not super excited about it. It’s a
redundant and non-obvious interface: I’ve seen people try to use both vectors
and 1-row matrices to do this. That suggests to me there’s no clear right
answer, so picking one way arbitrarily (appending only DataFrames to
DataFrames) is pretty reasonable.
— John
On May 26, 2014, at 8:14 PM, Kevin Squire <kevin.squ...@gmail.com> wrote:
> It shouldn't be that hard to make the array version work. I might give it a
> shot, unless that isn't desired.
>
> Kevin
>
> On Monday, May 26, 2014, Jason Solack <jaysol...@gmail.com> wrote:
> this works for me:
>
> dfA = DataFrame(A=[1:10], B=[11:20])
> dfB = DataFrame(A=11, B=21)
> append!(dfA, dfB)
>
>
>
> On Monday, May 26, 2014 11:59:28 AM UTC-4, Tomas Lycken wrote:
> I'm probably just being incredibly daft, but I can't figure out how to add a
> new row to a DataFrame.
>
> Basically, I have a bunch of data sets for which I want to perform some
> calculations - lets say the mean and standard deviation of something - each
> dataset corresponding to some named category of data. So I do the following
> to construct my new DataFrame
>
> julia> measures = DataFrame()
> julia> measures[:Mean] = Float64[]
> julia> measures[:StdDev] = Float64[]
> julia> measures[:Category] = Symbol[]
>
> Now, I want to add some values that are the results of a calculation on a
> different data set, and I try this:
>
> julia> push!(psispread, [1.0,0.1,:Fake])
> ERROR: no method push!(DataFrame, Array{Any,1})
> julia> append!(psispread, [1.0,0.1,:Fake])
> ERROR: no method append!(DataFrame, Array{Any,1})
> julia> psispread[1,:] = [1.0,0.1,:Fake]
> ERROR: BoundsError()
> in setindex! at /home/tlycken/.julia/v0.3/DataArrays/src/dataarray.jl:764
> in insert_single_entry! at
> /home/tlycken/.julia/v0.3/DataFrames/src/dataframe/dataframe.jl:410
> in setindex! at
> /home/tlycken/.julia/v0.3/DataFrames/src/dataframe/dataframe.jl:521
>
> Is there a nice and simple way to add a row to a DataFrame without having to
> do it one value at a time?
>
> // T
