Baunsgaard opened a new pull request, #1807:
URL: https://github.com/apache/systemds/pull/1807

   This commit adds documentation for the builtins PCA and Scale.
   
   For Scale we add a NaN handling on internally calculated vectors, to allow 
the Scale builtin to work on inputs containing NaN, by essentially not scaling 
or shifting columns containing NaN.
   
   PCA now include some code examples in the documentation and minor 
modifications such as a new argument onlyClusters that allow us to call PCA 
without having to apply the calculated eigenvectors to the input matrix. This 
modification is done because other instances i want to compare with only 
calculate PCA while not applying it. Also added is some minor comments inside 
PCA and removal of a matrix multiplication that is never used (and so far 
always compiled out as dead code when executing PCA)


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