Final answer:
The coding P-1 in a control matrix means process 1 is missing.
Step-by-step explanation:
In a control matrix, the coding P-1 means that process 1 is missing.
The control matrix is a tool used in computer programming to represent the flow of control between different parts of a program. Each row in the matrix represents a process or module, and each column represents a control relationship between processes.
When a process is missing in the control matrix, it means that it is not present or not included in the program. In this case, P-1 indicates that process 1 is missing.