Learning Julia

DataFrames

After discussing NA and DataArrays, now let's come to the most important data structure provided by the DataFrames module--DataFrame. As previously discussed, they contain extra information about the data they hold, or, in other words, the metadata.

This is how DataFrame is created:

julia> dframe = DataFrame(Names = ["John","Ajay"], Age = [27,28])
2×2 DataFrames.DataFrame
│ Row │ Names  │ Age │
├─────┼────────┼─────┤
│ 1   │ "John" │ 27  │
│ 2   │ "Ajay" │ 28  │

Now this dataset cannot be represented in the form of a DataArray. There are many reasons as to why DataFrames are unique in their purpose, including the following :

• They can hold data of different data types. A Matrix, which is just a 2D Array, cannot hold data of different ...