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...ll x<- something B<-A(x) When R executes this last statement, does it perform all the calculations inside function A again (i.e., all the calculations that yield 'y') or the value of 'y' is already stored in the function's local environment ? Many thanks. Paulo Gustavo Grahl, CFA

...y "f_something", make sure that all variables do not start with "f_" and then remove all BUT objects starting with "f_". However, I have already defined all the functions and it would be troublesome to change all of them to a new name. Any hint ? Thanks Paulo Gustavo Grahl, CFA