Help derivatives (probably my ignorance)

I take the derivative of a curve of time of position to get the speed. This works except the first and the last point vertically shot excessively. This is probably where my ignorance of not being in a classroom of calculation in a while. I guess it has something to do with how the functions derived from VI.

I've attached an example graph to show what he does.

You have a very large DC offset in the data.  Average about 5.7 with variations less than 0.1.  Subtract the average before you take the derivative.

The top graph is derived from (signal - average). Chart at the bottom is the signal.

Lynn

Tags: NI Software

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    Concerning

    Etbin

    Posted before you see the following

    the sequence # must be continuous, must avoid any shortfall or gaps with the numbering.

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