How to resolve the algorithm Kernighans large earthquake problem step by step in the Mathematica / Wolfram Language programming language

Published on 22 June 2024 08:30 PM
#Wolfram

How to resolve the algorithm Kernighans large earthquake problem step by step in the Mathematica / Wolfram Language programming language

Table of Contents

Problem Statement

Brian Kernighan, in a lecture at the University of Nottingham, described a problem on which this task is based. You are given a a data file of thousands of lines; each of three whitespace separated fields: a date, a one word name and the magnitude of the event. Example lines from the file would be lines like:

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Kernighans large earthquake problem step by step in the Mathematica / Wolfram Language programming language

This code imports the data from a text file named "data.txt" using the "Import" function, and expects the data to be in a table format.

It then applies the "Select" function to the imported data to filter the rows where the last element of each row is greater than 6 using the "GreaterThan[6]" function.

Here's a step-by-step explanation of the code:

  1. Import["data.txt", "Table"]: This line imports the data from the text file named "data.txt" and interprets it as a table. The "Table" argument specifies that the data is expected to be in a tabular format.

  2. Last: This function is applied to each row of the table. It extracts the last element of each row.

  3. GreaterThan[6]: This function is used to compare the last element of each row with the value 6. It returns True if the last element is greater than 6, and False otherwise.

  4. Select[Last / GreaterThan[6]]*: This line uses the "Select" function to filter the rows of the table based on the result of the "Last /* GreaterThan[6]" expression. It selects only the rows where the last element is greater than 6.

The output of this code will be a table containing only the rows where the last element is greater than 6.

Source code in the wolfram programming language

Import["data.txt", "Table"] // Select[Last /* GreaterThan[6]]

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