Fortran Code for Calculating Second-Order Derivative | Get Help Now!

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jimmytung
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I'm looking for a fortran code to calculate second-order derivative from a dataset. Please help me!
 
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Write a subroutine which calculates a derivative based on any method you want. Send your data to that subroutine to calculate the first derivative, then re-send that data again to get the second derivative.
 
thank you very much!
 

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