AR1                     Covariance Matrix with AR(1) Structure
CVTuningCov-package     Select Tuning Parameters based on CV in
                        Regularized Estimators of Covariance Matrices
F.norm2                 The Squared Frobenius Norm
L2.norm2                The Squared Operator Norm
banding                 A Banding Operator on A Matrix
hard.thresholding       Hard-thresholding Operator on A Covariance
                        Matrix
random.CV               Select Tuning Parameter for Regularized
                        Covariance Matrix by Random CV
regular.CV              Select Tuning Parameter for Regularized
                        Covariance Matrix by K-fold CV
soft.thresholding       Soft-thresholding Operator on A Covariance
                        Matrix
tapering                A Tapering Operator on A Matrix
