Changelog

2.0-beta-19

• descriptive stats works with mixed column name types
• argsort is now used for all sort functions
• -> versions of sort added so you can sort in -> pathways
• instants and such can used for sorting

Added Functions

• column->dataset - map a transform function over a column and return a new dataset from the result. It is expected the transform function returns a map.
• drop-rows, select-rows, drop-columns - more granular select calls.
• append-columns - append a list of columns to a dataset. Used with column->dataset.
• column-labeled-mapseq - Create a sequence of maps with a :value and :label members. this flattens the dataset by producing Y maps per row instead of 1 map per row where the maps themselves are labeled with the value in their :value member. This is useful to building vega charts.
• ->distinct-by-column - take the first row where a given key is present. The arrow form of this indicats that unlike distinct, the dataset is the first argument.
• ->sort-by, ->sort-by-column - Forms of these functions for using in (->) dataflows.
• interpolate-loess - Produce a new column from a given pair of columns using loess interpolation to create the column. The interpolator is saved as metadata on the new column.

2.0-beta-16

• Missing a datetime datatype for parse-str and add-to-container! means a compile time error. Packed durations can now be read from mapseqs.

2.0-beta-15

• Descriptive stats now works with instants.

2.0-beta-14

• Descriptive stats now works with datetime types.

2.0-beta-12

• Support for parsing and working with durations. Strings that look like times - "00:00:12" will be parsed into hh:mm:ss durations. The value can have a negative sign in front. This is in addition to the duration's native serialization string type.
• Added short test for tensors in datasets. This means that the venerable print-table is no longer enough as it doesn't account for multiline strings and thus datatets with really complex things will not print correctly for a time.

2.0-beta-11

• Various fixes related to parsing and working with open data.
• tech.ml.dataset.column/parse-column - given a string column that failed to parse for some reason, you can force the system to attempt to parse it using, for instance, relaxed parsing semantics where failures simply record the failure in metadata.
• relaxed parsing in general is supported across all input types.

0.26

Added

• rolling (rolling windows of computed functions - math operation)
• dataset/dssort-by
• dataset/ds-take-nth

0.22

Added

• PCA