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