f_1D                    Output values of the evaluation of a function
                        with one input variable and defined as a linear
                        combination of B-splines
f_2D                    Output values of the evaluation of a function
                        with two input variables and defined as a
                        linear combination of a tensor product of
                        univariate B-splines
glober                  Estimating Functions with Multivariate
                        B-Splines
glober.1d               Estimation of functions with one input variable
glober.2d               Estimation of functions with two input
                        variables
x_1D                    Observation vector x of one variable
x_2D                    Observation matrix x of two variables
xpred_1D                Values of the single input variable for which a
                        function has to be estimated
xpred_2D                Values of the two input variables for which a
                        function has to be estimated
y_1D                    Values of the response variable of the noisy
                        observation set of one input variable
y_2D                    Values of the response variable of the noisy
                        observation set of two input variables
