Write the select Train () function described in Section 1.5.2. This function has 3 parameters: angle New Obs, the angle of the new observation; signals, the training data, i.e., data in the format of offline Summary; and m, the number of angles to include from signals. The function returns a data frame that matches train SS, i.e., select Train () calls reshape SS () (see Section 1.5.2 for this function definition).