Andrus Adamchik
Andrus Adamchik
This is not a bug report, but a message for @SpencerPark and the iJava community. Myself, my colleagues and open source collaborators at DFLib.org are avid iJava users. I am...
Just like we support pretty-printing of DataFrames and Series, let's do the same for the `GroupBy` object to be able to inspect they keys and value counts. E.g., tabular format:...
Representing `BooleanSeries` internally as a bitset instead of `boolean[]` results in a very compact data structure (1/8 of byte vs 1 byte). Access is probably slower , but we can...
In a ECharts "boxplot" series, `layout: 'horizontal'` or `layout: 'vertical'` have no effect on the series orientation (so [that property ](https://echarts.apache.org/en/option.html#series-boxplot.layout) was omitted from the Java API). But encoding series...
Hi @mathijs81 , Found your [Java DataFrame comparison](https://medium.com/@thijser/doing-cool-data-science-in-java-how-3-dataframe-libraries-stack-up-5e6ccb7b437) blog recently. It is a pretty cool comparison, and I wanted to add one more contender : [DFLib](https://github.com/dflib/dflib) 🙂 DFLib is pure...
With [the latest changes](#422 ) to column set expansions api, `ColumnSet.expand(..)` and "ColumnSet.expandArray(..)" became harder to use in one respect - we can no longer directly assign column names to...
_See #567 for a logical prerequisite that makes this feature possible._ The last remaining disparity between Exp API and QL is the lack of user-defined functions in the latter. Let's...
_This is a prerequisite for #558._ Let's rework the QL grammar to remove hardcoded function definitions. At the parser level, functions should be purely syntactic constructs with zero or more...
Let's port `head(..)`, `tail(..)` functions to the RowSet by introducing `DataFrame.rowsHead(..)`, `rowsTail(..)`. This symmetrical to what we are doing with columns per #439
A frequent implicit assumption in DFLib is that DataFrames have a lot of rows and a fairly small number of columns. But of course there are datasets with hundreds (thousands?)...