Read the equation
P names the existing program or codebase at the repair step under consideration. It stays fixed while different candidate programs P′ are compared, so the change-cost term C(P′−P) measures each proposal relative to the same starting code. In the recursive update P_(t+1)=R(P_t,D_t), P_t is this current program at iteration t. The slash in “program / codebase” separates two descriptions of the same object; it is not a division operation.
Its role in the build
The Rhiannon Equation
Terms & definitions
| Term | Meaning in this source |
|---|---|
| P | The current program or codebase. |
| P_t | The current program at repair iteration t. |
| P′ | A candidate program compared with the current P. |
| C(P′−P) | The poster’s change cost for the proposed modification relative to P. |
How it works
Identify the program or codebase being repaired and denote it by P.
Use that same P as the reference when comparing the changes made by candidate programs P′.
In the recursive notation, attach the iteration index t to distinguish the current program P_t from the next program P_(t+1).
Assumptions & limits
The poster does not define a numerical representation of a program or an exact implementation of the difference used by C(P′−P).
Original context
Read the surrounding source passage
The Rhiannon Equation: P denotes the code before a repair is applied.
Exact original notation
P = current program / codebase
Related builds
Sources & provenance
P = current program / codebase