I need to to a DataFramce of DataFrames. When I use

```
dh=[DataFrame(a=1,b=1);DataFrame(a=1,b=1)]
```

it is OK since dh is a DataFrame. Indeed, I obtain this DataFrame:

2 rows × 2 columns

a b

Int64 Int64

1 1 1

2 1 1

Nevertheless, when I use:

```
dg=DataFrame()
dg[1]=DataFrame(a=1,b=1)
dg[2]=DataFrame(a=1,b=1)
df=[dg[1];dg[2]]
```

I obtain a structure which is NOT a DataFrame but 2 arrays. Indeed, I obtain:

2-element Array{DataFrame,1}:

1×2 DataFrame

Row a b

Int64 Int64

1 1 1

1×2 DataFrame

Row a b

Int64 Int64

1 1 1

Could you tell me how to obtain a DataFrame df identical to dh BUT by using df=[dg[1];dg[2]] ?

Thanks !