[Gretl-users] Creating a new series

Dear Gretl Community, I have 2 time-series, X and Y, and I need to create a new one, Z, that is defined as: Z(1) = X(1) Z(2) = Z(1) + Y(2) Z(3) = Z(2) + Y(3) . . . Z(n) = Z(n-1) + Y(n) Where Z(1) is the first observation of the series Z, Z(2) is the second observation of the series Z, and so on. How can I do this with Gretl? Best, -- Henrique C. de Andrade Doutorando em Economia Aplicada Universidade Federal do Rio Grande do Sul www.ufrgs.br/ppge