Generate two dimensional data set in Matlab

Actually I want to generate two dimensional data set in Matlab that contains two different classes, denoted as class "o" and class "+", respectively. The data point's for the "o" class are generated from a mixture of three Gaussian distributions, while a uniform distribution is used to generate data point's for the class "+". There are altogether 1200 pint's belonging to the class "o" and 1800 point's belonging to the "+" class. How can I do that ?