R Data Table

R is programming language and free software environment for Statistical Computing and Data Analysis used by data miners and statisticians.
Data Table (data.table) is highly useful for Data Manipulation operations.

R Data Table Case Study Text

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Abbreviations (14)

ARCH - Architecture

DB - Database

Defn. - Definition

Dev. - Development

df - Data Frames

dm - Decision Making

DS - Data Structure

DT - Data Table

EVOL - Evolution

PM - Portfolio Management

SEM - Semantics

SYN - Syntax

SYS - System

VM - Virtual Machine

Economics

Defn.

Finiteness of Resources

Maximization - Various Parameters

Finiteness of resources

SYS

Chess game

Finite dm

EVOL - dm, Intervals, Finiteness of Resources, Monitor EVOL of SYS

VM ARCH of PM

Complete Problem

General Model

Financial Modelling

Complete for any business

Isomorphic (organization, employees, start-termination)

Looks to be a small problem

Simplest Modelling

Very Enlightening

Programming

SYS Debugging

SYN - Automatic

SEM - Auxillary Variables, 5 Adhoc Columns, Tracing Time Dev. of whole SYS State, EVOL

ARCH

Arithmetic, PM

Fundamental Operations

Sorting, Searching

Finite variables, symbols (varying number of parameters), selection (finite)

Factorization

Disjoint Operations

Must, not an option

3 Steps (Factorise, Solve, Combine)

Sticking to DS

DS

Shortest Program

Any DB problem can be approached

Code eminently readable

Style guide

Variables, blocks

df

210 df

4000 operations/commands

Each file 20 operations

Choose between SEM right strategies

dm

Not random buy sell

Extra fields, extra dm

4000 automatic, not humanly possible

Discipline

Sticking to DS, DT, List of lists, Lisp programming

If given to solve to else may take any amount of time

Like Irodov problems

Size, Existence, Auxillary Variables (order, reorder columns)

Proper EVOL

No unnecessary combining together

Example: A, B, C. D depends on A, B, C. Cannot have E depending on D. Code to be factored.

Cases, Combinations, Scope Restrictions (cause beautiful factorisation of code at conceptual level)

Naturally, in Bhatti Kavya, intended aim was known with set of rules. Ashtadhyayi was known. Explained through specific case of Ramayana.

Not academic project

Real life project to be deployed, must be right

Strategy building and combining

Stepwise Understanding of Knowledge Process through R Data Table

Mind Maps in three iterations on A4 paper.
Beauty is Understanding
- Balance
- Symmetry
- Simplicity
Factorization
- About same number of iterations on soft copy mind maps
  - (Re)Balance
  - (Re)Arrange
  - (Re)Order
  - Shorten
  - Simplify