# speed calculation in time graph

It would be very useful to calculate the speed of change in the y axis at every point in the time series. Something like this:

chart.series[0].points[0].y.speed(year)

speed(Year) would calculate the rate of change per year, or month or day of the Yaxis variable,

you could also implement acceleration

chart.series[0].points[0].y.acceleration(year)

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