The confection of a Matlab function which serves as an interface between MATLAB and the programs TRAMO-SEATS has once more confirmed the refrain “to make a necessity of virtue”. The more or less massive use of TRAMO-SEATS for time-series analysis by more and more economic business cycle and research departments, together with the implementation of matrix-calculus programs like MATLAB made necessary to develop a function in MATLAB with certain features. Among the aims pursued we can find that of being able to simultaneously use TRAMO-SEATS for processing a large set of time-series, as well as that of having a powerful and easy-to-use storage and working tool at one’s disposal.