is an attribute that indicates zero derivative of a symbol with respect to all parameters.
- Constant is used by Dt.
- Functions f[…] are taken to have zero total derivative if f has attribute Constant.
- Mathematical constants such as Pi have attribute Constant.
Examplesopen allclose all
Basic Examples (2)
π is a mathematical constant representing a number:
π is not explicitly a number:
π is numeric and evaluates to a number with N:
Define f to be a constant function for total derivatives computed with Dt:
The built-in system mathematical constants:
They are all NumericQ:
They all represent exact values that can be evaluated to numbers of any precision with N:
Define f locally to be a constant function:
This does not affect subsequent computations with Dt:
Using the Constants option in Dt is similar, but has completely unambiguous output: