Convert single dimensional Array to DataFrame in Julia

3
votes

I have a single dimensional Array output (as shown below) and need to be converted to DataFrame. 

x = rand(4)
4-element Array{Float64,1}:
 0.951252
 0.936421
 0.773268
 0.207913

p = convert(DataFrame, x) // Why this doesn't work ?

This results in:

MethodError: Cannot convert an object of type Array{Float64,1} to an object of type DataFrames.DataFrame This may have arisen from a call to the constructor DataFrames.DataFrame(...), since type constructors fall back to convert methods.

Why this doesn't work ?

1
dataframejulia

1 Answers

6
votes

I think that DataFrame needs column name. You could use for example this: 

julia> df = DataFrame(column_name = x)
4×1 DataFrames.DataFrame
│ Row │ column_name │
├─────┼─────────────┤
│ 1   │ 0.349747    │
│ 2   │ 0.718652    │
│ 3   │ 0.0984634   │
│ 4   │ 0.553987    │

If you have problem with julia then good start is to use help:

julia>?DataFrame

if you press ? as first character prompt is changed to 

help?> DataFrame

after pressing enter you could see help in this case with examples.

Maybe some tutorial. For example wikibook could help too.