UTL_NLA package, we can call routines to perform PCA on vectors and matrices represented as VARRAYs. How ever, vectors and matrices are stored in VARRAYs with a maximum size of one million entries. Given this restriction, UTL_NLA vectors can be up to one million entries but matrices need to be of size RxC <= 1,000,000.That's why I have developed my own functions to perform PCA. It is much easier to use and can handle unlimited number of records. Data and operations always stay in the database.
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