docs: public static LinearSolverDense<DMatrixRMaj> symmPosDef(int matrixWidth ) {
          if(matrixWidth < EjmlParameters.SWITCH_BLOCK64_CHOLESKY )  {
              CholeskyDecompositionCommon_DDRM decomp = new CholeskyDecompositionInner_DDRM(true);
              return new LinearSolverChol_DDRM(decomp);
          } else {
              if( EjmlParameters.MEMORY == EjmlParameters.MemoryUsage.FASTER )
                  return new LinearSolverChol_DDRB();
              else {
                  CholeskyDecompositionCommon_DDRM decomp = new CholeskyDecompositionInner_DDRM(true);
                  return new LinearSolverChol_DDRM(decomp);
              }
          }
      }