R help - Jun 2013 - Step wave Detection using R

I am trying to detect a positively increasing trend in a time series data,
to
which when I apply the rolling mean it almost turns into a step wave
function. The sharp rise in slope of rolling mean is an indication of
positive trend, thus the rolling mean becomes like a step wave function.

Is there a way or package to automatically detect the sharp increase in
slope?

-P

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