Heat oven to 350° F. In a large mixing bowl, combine, flour, baking soda and sugar. Add eggs, pineapple, with its juice, and nuts; mix well.
Pour into lightly greased 9x13x2-inch baking pan. Bake 35 to 45 minutes. Cool.
Beat softened cream cheese until fluffy. Whip in confectioners' sugar and softened butter. Spread the whipped cream cheese mixture over the cooled cake.
Cut in 3-inch squares.Servings: 12