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Returns the derivative of the argument with respect to its reference. If the argument has no reference the function returns the derivative with respect to the argument's index - in effect a vector containing the difference between successive values in the argument. For details on references see Vector References.
| Number | Type | Compulsory | Default | Description |
|---|---|---|---|---|
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1 |
real array |
Yes |
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vector |
Return type: real array
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