RCOde need urgent HELP

hey i need help with a case in my R project.

i have a vector Rt with returns from day 1 till day t  now i want to form a
new vector r= which is rt = Xt ? Xt?1

then i want to definde positive and negative aggregates

r(n)+ _t= 1/n (rt +...+rt?n) I {(rt+...+ rt?n) ?0}
r(n)? _t= 1/n (rt +...+rt?n) I {(rt+...+ rt?n) <0}

thanks for the help 




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