[R] sequential input script dataframe process functionality

[rl at openmailbox.org]

Subscribers,

Could someone please indicate correct terminology and relevant manual 
sections to achieve the following conceptual workflow, to create a 
script to select sequentially parts of a dataframe:

> "Welcome to this R script program"
> Select level number below of variable 'X'
[1]
[2]
[3]
> 3
> Select level number below of variable 'Y'
[1]
[2]
> 1
> Summary
X, [2] 'descriptive text A for level 3 selected'
[1] 'descriptive text B for level 1 selected'
> Display graph? Y/N
> y
> [specific selected script activated, graph displayed]

Thanks in advance.

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