[R] RCOde need urgent HELP

[felice]

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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