## Let’s think about a pendulum with air resistance

A pendulum without air resistance has been thought about a lot. However, in reality, there is and it is necessary to consider more realistic physics.

## Let’s solve Lotka-Volterra equations!

Lotka-Volterra equations are solved and some model explanations also given.

## Using gnuplot to do everything from data plotting to fitting and reuse

gnuplot is a free and easy to use software that can plot the data. Fitting the data...

## How to install gnuplot

gnuplot is a free software that mainly plots various graphs, animations, and so on...

## Let’s calculate the sum of factorials!

The sum of factorials is calculated. It is the sum of integers, but the story does not fit within integers. That's mysterious...

## Finding GCD and LCM with C++

We sometimes need to find GCD and LCM for competitive programming. This time I summarized how to write...

## How to solve simultaneous linear equation with a tridiagonal matrix

A tridiagonal matrix, a special but easy to use matrix is introduced. Here, looking into a simultaneous linear eq...

## Converting decimal numbers to k-decimal with C++

We sometimes need to convert decimal numbers to the k-decimal ones. For example, in the...

## Let’s use queue brilliantly!Breadth First Search with C++!

BFS (Breadth-First Search) is one of the popular ways to search all of the vertices on a given graph. I write this article to understand well.