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how to get differential of variable

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Old   July 8, 2006, 21:34
Default how to get differential of variable
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Hi I would like to know how to get a differetial of variable, eq, dT/dx, d(SCALAR(01))/dx, dp/dy, at each time step in transient calculation. I want to make a certain calculation by using these values in user-subroutine. Thank you for your attention.
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