Developer Journal - April 2018
A reviewed monthly digest generated from public GitHub activity.
This developer-journal entry was generated with a local AI model from my public GitHub activity, then reviewed before publication.
Digest
Added spherical harmonic calculation classes and Spark ML feature transformers, including Climate_ConvertSparkDatesToCsv and ConcatColumns utility.
Implemented initial Spark utility library with column operations and data processing tools.
Spherical Harmonic Climate Data Processing
Added new spherical harmonic calculation classes (CalculateHarmonic_new.java) and climate data processing utilities (Climate_ConvertSparkDatesToCsv.java, Climate_PcaStations_IndivDates.java). Modified discrete spherical transform utilities (DiscreteSphericalTransform.java) and helper classes (DoubleArray.java).
Introduced SphericalHarmonics_LongTermStations_FullSpectral_SaveSource.java for long-term station spectral analysis.
Notable sources
Spark ML Feature Transformers
Initial commit of Spark ML feature transformers including ConcatColumns, DropColumns, and ExplodeVector utilities. Added test cases and utility classes (SparkUtils.java, SetupSparkTest.java).
Refined class headers and minor cleanups (e.g., ConcatColumnsWriter.java, ExplodeVectorFlatMap.java).
Notable sources
- https://github.com/dafrenchyman/spark/commit/46292db4802347005b5c4e4a9f13e6b9d275f3cf
- https://github.com/dafrenchyman/spark/commit/de0357989bd3b9e1ae3adc3be45395f1d601b171