Singular Manual: diffAlgebraChangeOrd

| #### D.15.2.5 diffAlgebraChangeOrd Procedure from library `difform.lib` (see difform_lib). Usage: diffAlgebraChangeOrd(#); # list Assume: the current basering is the differential algebra Return: the differential algebra with changed monomial ordering Note: - an ordering is defined via the following pattern: - #[i] = 'gen' defines the ordering on the generators dx_i - #[i+1] must then be a valid monomial ordering as string - #[i+2] an optional weight vector - #[i] = 'ringvar' defines the ordering on the ringvariables - #[i+1] must then be a valid monomial ordering as string - #[i+2] an optional weight vector - only use for interior computations - differential forms are polynomials in the differential algebra - not in the returned ring - do not define differential forms as polynomials in the returned ring since this is another data-ring - an error occurs if: - no valid monomial ordering is given - no weight vector is given but a weighted monomial ordering - a given weight vector has wrong dimension - weight vectors are ignored if the given ordering is not weighted See also: difformIsBigger; difformIsSmaller; difformListSort.

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