Integral curve/Differentiate
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Accessible through menu option Signal tools/Integral curve ( graphic toolbar button) and Signal tools/Differentiate ( graphic toolbar button)

Integral curve

This option enables you to see how the integral of the signal changes through time. The result will be a new signal curve where n-th value in this curve will represent the integral of the origin signal from its beginning until its n-th sample.

If you need only to calculate a simple numerical integral of the signal (area under the signal curve), please use the corresponding option from Instruments and markers menu.

Differentiate

This option calculates the first derivation of the signal by subtracting consecutive signal values from the origin values and forming new curve from subtraction results. It means that the n-th value in new curve will be equal to the difference between n-th and (n-1)-th value from the origin signal. This is only a rough approximation of the first derivation and should not be used on fast changing signals. Before applying this function to such signal, you may try smoothing it first by using appropriate Smoothing  option.
Integral curve and Differentiate options