# source:SH_SHM/trunk/help/DERIVE.HLP@206

Revision 16, 910 bytes checked in by marcus, 15 years ago (diff)

r1 | svn | 2007-12-13 11:10:29 +0100 (Do, 13 Dez 2007) | 2 lines

Initial import

Line
1command DERIVE <trc-list> <algorithm>
2==============
3
4key: compute derivative
5
6Computes derivatives of all traces given by <trc-list>.  The
7input traces remain unchanged.  The DERIVE command creates
8new traces containing the derivatives.
9
10
11parameters
12
13<trc-list>  ---  parameter type: trace list
14   List of traces to be derived.  These traces remain unchanged.
15
16<algorithm>  ---  parameter type: integer
17   ID of algorithm used to compute derivative.  Valid vales are
18   1 to 5.  The algorithms are listed below (h is sample distance):
19      1: y'[i] = 1/(2h) (-y[i-1] + y[i+1])
20      2: y'[i] = 1/(12h) (y[i-2] - 8y[i-1] + 8y[i+1] - y[i+2])
21      3: y'[i] = 1/h (-y[i] + y[i+1])
22      4: y'[i] = 1/(2h) (-3y[i] + 4y[i+1] - y[i+2])
23      5: y'[i] = 1/(12h) (-3y[i-1]-10y[i]+18y[i+1]-6y[i+2]+y[i+3])
24
25
26Example:
27
28   DERIVE 1-3 3    ! computes derivative of traces 1-3 by algorithm
29                   ! number 3
30
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