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- Click Transform > Differentiated variables in the menu.
- Enter a name for the new variable set.
- Enter prefix, default: DIFF_
- Enter Step duration. For more information, see Step duration.
- Select Input variables or variable set.
- Select Differential method. For more information, see Newton, Symmetric and High order.
The derivative options are:
- Newton: difference quotient (order 1)
- Symmetric: difference quotient (order 2)
High order: five-point stencil
- Select the Direction, Left or Right. See below that it is the formula used to derive the variable with the Newton method.
- Click Save.
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Formula used to derive the variable:
With:
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Formula used to derive the variable with the Newton method:
With :
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