Logical and Physical Data
- A way of understanding data structures -
1. Algorithms - Princeton - Coursera
2. Algorithms Booksite
Logical Data structures - definition
A logical data structure is defined by its API
and the semantics of each of the APIs.
It does not either imply the physical
implementation of the data structure nor
necessitate a specific implementation.
While several implementations exist for each
logical data structure some are optimal vis-a-vis
Some of the logical data structures include
o Priority Queues
● Symbol Tables
Physical - Generic
Physical data structures are constructed based on the organization of the
computing machine. The memory structures both scale and hierarchy,
instruction set both operations and registers drive the physical design of a data
There are two physical implementations of data structures at the most generic
abstraction level for a computing machine (a deterministic turing machine as
opposed to a quantum).
Physical - Specialized
The two generic physical data structures can be further specialized as follows
o unordered array
o ordered array
o Linked Lists
● Binary Search Trees
o Self Balancing Binary Search Trees
Left Leaning Red Black Tree
o Acyclic Graphs
Directed Acyclic Graphs
o Cyclic Graphs
o And all other variants
Physical - Illustrative
Implementations - Symbol Table
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