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deriv

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• name:
  deriv
• synopsis: deriv inputfile outputfile [-interval= integer] [-x_sigma= value] [-y_sigma= value]
• description:
  deriv takes the finite-difference derivative of a data set with optional error propagation, using where and where m is specified by the user. Strictly, the points should be equispaced (if not, use m=1).

• files:
  inputfile is the input data set, the derivative of which is placed in outputfile.
• options:

  interval

  
  The interval (in numbers of data point) over which the derivative is approximated. This is m in the equation above. The default interval is 1.

  sigma_x

  
  The uncertainty value to assign to the x (ordinate) input values.

  sigma_y

  
  The uncertainty value to assign to the y (ordinate) input values.

• see also:

  
  filter, integ.