Thank you very much Milan ! When I searched a solution in DataFrame documentation I did not found the keyword "similar". Is there an equivalent for Julia of this website <http://perldoc.perl.org/index-functions-by-cat.html>for Perl for example ?
julia> df = readtable("test2.tsv") 4x4 DataFrames.DataFrame │ Row │ row1 │ x3_39 │ x2_5 │ x4_5 │ ┝━━━━━┿━━━━━━━━┿━━━━━━━┿━━━━━━┿━━━━━━┥ │ 1 │ "row2" │ 3.46 │ 2.7 │ 4.8 │ │ 2 │ "row3" │ 3.58 │ 2.9 │ 4.7 │ │ 3 │ "row4" │ 3.7 │ 2.7 │ 4.9 │ │ 4 │ "row5" │ 3.81 │ 3.0 │ 5.3 │ julia> m = similar(df,0) 0x4 DataFrames.DataFrame julia> m 0x4 DataFrames.DataFrame julia> df[2,:] 1x4 DataFrames.DataFrame │ Row │ row1 │ x3_39 │ x2_5 │ x4_5 │ ┝━━━━━┿━━━━━━━━┿━━━━━━━┿━━━━━━┿━━━━━━┥ │ 1 │ "row3" │ 3.58 │ 2.9 │ 4.7 │ julia> append!(m, df[2,:]) 1x4 DataFrames.DataFrame │ Row │ row1 │ x3_39 │ x2_5 │ x4_5 │ ┝━━━━━┿━━━━━━━━┿━━━━━━━┿━━━━━━┿━━━━━━┥ │ 1 │ "row3" │ 3.58 │ 2.9 │ 4.7 │ julia> m 1x4 DataFrames.DataFrame │ Row │ row1 │ x3_39 │ x2_5 │ x4_5 │ ┝━━━━━┿━━━━━━━━┿━━━━━━━┿━━━━━━┿━━━━━━┥ │ 1 │ "row3" │ 3.58 │ 2.9 │ 4.7 │