compute derivative
command: DERIVE <trc-list> <algorithm>
Computes derivatives of all traces given by <trc-list>. The input traces remain unchanged. The DERIVE command creates new traces containing the derivatives.
parameters
- <trc-list> parameter type: trace list
List of traces to be derived. These traces remain unchanged.
- <algorithm> parameter type: integer
ID of algorithm used to compute derivative. Valid vales are 1 to 5. The algorithms are listed below (h is sample distance):- y'[i] = 1/(2h) (-y[i-1] + y[i+1])
- y'[i] = 1/(12h) (y[i-2] - 8y[i-1] + 8y[i+1] - y[i+2])
- y'[i] = 1/h (-y[i] + y[i+1])
- y'[i] = 1/(2h) (-3y[i] + 4y[i+1] - y[i+2])
- y'[i] = 1/(12h) (-3y[i-1]-10y[i]+18y[i+1]-6y[i+2]+y[i+3])
example
- derive 1-3 3
- computes derivative of traces 1-3 by algorithm number 3
