Derived From a Fish Function in Flac3D

Is there any way to calculate the derivative of a dynamic fish function (that is, executed at each time step) in Flac3D? It occurs to me to create another fish function that calculates both the delta of the variable belonging to the function and the delta of time, but I don’t know how to identify the current step with respect to the previous step.

You can plot the history of the variable, and also the history of the time, specify a time interval. then there are several options:
(1) export these two histories to an Excel file, then calculate in Excel;
(2) export these two histories into a table, then use the FISH function “dev.his” to calculate;
(3) You can also write a small FISH function directly.

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