Contents

Index

• Getting Started

• User Guide

• Functions

• Desktop Tools and Development Environment

• Data Import and Export

• Mathematics

• Arrays and Matrices

• Linear Algebra

• Elementary Math

• Polynomials

• Interpolation and Computational Geometry

• Cartesian Coordinate System Conversion

• Nonlinear Numerical Methods

• Specialized Math

• Sparse Matrices

• Math Constants

• Data Analysis

• Programming and Data Types

• Object-Oriented Programming

• Graphics

• 3-D Visualization

• GUI Development

• External Interfaces

• Examples

• Release Notes

Learn more about MATLAB

pi - Ratio of circle's circumference to its diameter

Syntax

pi

Description

pi returns the floating-point number nearest the value of π. The expressions 4*atan(1) and imag(log(-1)) provide the same value.

Examples

Find the sine of π:

sin(pi)

returns

ans =

   1.2246e-16

The expression sin(pi) is not exactly zero because pi is not exactly π.

persistent

pie

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