Tables as lists of rows

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Lecture 2 - Page 24 : 46

Functional Programming in Scheme
Expressions, Types, and Functions

Tables as lists of rows

It is natural to represent tables as lists of rows, and to represent a row as a list

Tables play an important roles in many web documents

LAML has a strong support of tables

Expression

Value

tab1

(("This" "is" "first" "row")
 ("This" "is" "second" "row")
 ("This" "is" "third" "row")
 ("This" "is" "fourth" "row")
)

(show-table tab1)

This	is	first	row
This	is	second	row
This	is	third	row
This	is	fourth	row

(show-table (transpose-1 tab1))

This	This	This	This
is	is	is	is
first	second	third	fourth
row	row	row	row

(show-table (eliminate-row 2 tab1))

This	is	first	row
This	is	third	row
This	is	fourth	row

(show-table (eliminate-column 4 tab1))

This	is	first
This	is	second
This	is	third
This	is	fourth

Examples of table transposing, row elimination, and column elimination. We will program and illustrate these functions in a later exercise of this material. The function show-table is similar to table-0 from a LAML convenience library. Using higher-order functions it is rather easy to program the show-table function. We will come back to this later in these notes.

Later in this material we will study possible implementations of the function show-table