ECD                     ECD algorithm for estimating the envelope
                        subspace
EEG                     Electroencephalography (EEG) dataset for
                        alcoholism study.
FGfun                   The Objective function and its gradient
MenvU_sim               Generate matrices M and U
OptM1D                  Estimate the envelope subspace ('OptM' 1D)
OptMFG                  Estimate the envelope subspace ('OptM' FG)
OptStiefelGBB           Optimization on Stiefel manifold
PMSE                    Prediction and mean squared error.
TPR.fit                 Tensor predictor regression
TPRdim                  Envelope dimension by cross-validation for
                        tensor predictor regression (TPR).
TPRsim                  Generate simulation data for tensor predictor
                        regression (TPR)
TRES-package            Tensor Regression with Envelope Structure
TRR.fit                 Tensor response regression
TRRdim                  Envelope dimension selection for tensor
                        response regression (TRR)
TRRsim                  Generate simulation data for tensor response
                        regression (TRR)
Tenv_Pval               The p-value and standard error of coefficient
                        in tensor response regression (TRR) model.
bat                     Bat simulated data
kroncov                 The covariance estimation of tensor normal
                        distribution
manifold1D              Estimate the envelope subspace ('ManifoldOptim'
                        1D)
manifoldFG              Estimate the envelope subspace ('ManifoldOptim'
                        FG)
oneD_bic                Envelope dimension selection based on 1D-BIC
plot.Tenv               Plot coefficients and p-value for Tenv object.
predict.Tenv            Predict method for Tenv object.
simplsMU                SIMPLS-type algorithm for estimating the
                        envelope subspace
square                  Square simulated data
std_err                 Elementwise standard error.
subspace                The distance between two subspaces.
summary.Tenv            Summarize method for Tenv object.
ttt                     Matrix product of two tensors
