element interpolation solid; emm In a recent paper Palfia has proposed a general method for extending the definition of binary matrix means to the multivariable case. are realised as limits of sequences of two-variable when more than two variables are involved. can be derived from the two-variable case. The definition for G involves all the m matrices at the same time, have not arisen naturally in that context. element mass{option} More recently there has been vigorous interest in this mean because of its use in image and signal processing problems. (See the article by Barbaresco [4] for an excellent account). am be vectors in a Euclidean space and consider the averages s j defined as Am be positive matrices and consider the ¡°asymmetric averages¡± However there is an adaptation of this idea¡ªa sequence of such averages that converges to G. ¦Ä2) is a complete metric space of nonpositive curvature.