Modified luDecompose to require that the matrix be square. Added RealMatrix preMultiply(RealMatrix). Modified preMultiply(double[]) to return a double[]. Renamed private pivot[] array to permutation[]. Exposed lu decomposition matrix and associated permutation array as protected properties.
jakarta/commons/proper/math/trunk/src/java/org/apache/commons/math/linear/RealMatrixImpl.java