But
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Perform mathematical operations on function-type data structures.

The operator allows you to perform general operations on functions (integration, derivative, absolute value, absolute value, combination, polynomial regression...) and operations dedicated to signal processing and earthquakes (calculation of FFT, envelope smoothing, accelerogram correction...).

Produce a function, function_c, or table data structure, depending on the factor keyword used.

At the output of the command, the function is reordered by increasing abscissa.

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