[R] Counting Na values on a time serie only on the past datas

[anna]

Hello everyone, I have a time serie of n values, some are na's. I want to get
a vector of size n whose elements represent on the time t < n the number of
missing values between o and t. I know I can do it with a loop but I wanted
to know if there was a function or a special syntax to do this. Thanks a
lot!
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