Add additional conversion functionality to get data out of Transactions objects. This may cause issues with large datasets, as Transactions use sparse representation and a DataFrame is an inherently dense format, but for smaller datasets, the convenience is worth the tradeoff.
[x] Write a function which converts matrix and keys in a Transactions struct to dataframe with index column
Add additional conversion functionality to get data out of Transactions objects. This may cause issues with large datasets, as Transactions use sparse representation and a DataFrame is an inherently dense format, but for smaller datasets, the convenience is worth the tradeoff.