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D.15.2.34 derivationToString
Procedure from library difform.lib (see difform_lib).
- Usage:
- derivationToString(phi,#); phi derivation, # list
- Return:
- the derivation as a string, describing the image of the degree-1 generators,
optionally ordered by a given monomial ordering on the generators
- Remarks:
- To sort the images of the generators in the output string, difformListSort is used.
- Note:
- to define an ordering for the generators, one can use:
- #[1] = 'gen'
- #[2]: a monomial ordering as string
- #[3]: an optional weight vector
the standard ordering is the ordering of the differential algebra
Example:
| | LIB "difform.lib";
ring R = 0,(x,y,z),dp;
diffAlgebra();
==> // The differential algebra Omega_R was constructed and the differential \
forms dDx, dDy, dDz, dx, dy, dz are available.
list L; L[1] = list(dx,dy,dz); L[2] = list(x2,y-23xz,xz4);
derivation phi = L;
///////////////////////////////////
// String with standard ordering //
///////////////////////////////////
print(derivationToString(phi));
==> Omega_R^1 --> R
==> dz |--> xz4
==> dy |--> -23xz+y
==> dx |--> x2
==>
//////////////////////////////////
// String with changed ordering //
//////////////////////////////////
print(derivationToString(phi,"gen","wp",intvec(-1,-1,1)));
==> Omega_R^1 --> R
==> dy |--> -23xz+y
==> dx |--> x2
==> dz |--> xz4
==>
kill Omega_R,dx,dy,dz,L,phi;
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See also:
derivationPrint;
difformGenToString;
difformListSort.
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