How to resolve the algorithm One of n lines in a file step by step in the Tcl programming language

Published on 12 May 2024 09:40 PM
#Tcl

How to resolve the algorithm One of n lines in a file step by step in the Tcl programming language

Table of Contents

Problem Statement

A method of choosing a line randomly from a file: Is to:

Note: You may choose a smaller number of repetitions if necessary, but mention this up-front. Note: This is a specific version of a Reservoir Sampling algorithm: https://en.wikipedia.org/wiki/Reservoir_sampling

Let's start with the solution:

Step by Step solution about How to resolve the algorithm One of n lines in a file step by step in the Tcl programming language

Source code in the tcl programming language

package require Tcl 8.5
proc 1ofN {n} {
    for {set line 1} {$line <= $n} {incr line} {
	if {rand() < 1.0/[incr fraction]} {
	    set result $line
	}
    }
    return $result
}

for {set i 0} {$i < 1000000} {incr i} {
    incr count([1ofN 10])
}
parray count;   # Alphabetic order, but convenient

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