# 3.6. Packages, Macros and Graphics¶

## 3.6.1. Packages¶

Code Meaning
$\usepackage{fullpage}$

Full page (minimal margins) - positioned after \documentclass and before \begin{document}
$\usepackage[top=1in, bottom=1in, left=1in, right=1in]{geometry}$

Specification of the margins using the geometry package, same as \usepackage{fullpage}.
$\usepackage[margin=1in, paperwidth=8.5in, paperheight=11in]{geometry}$

Specification of margins using the geometry package with specification of paper width and height, same as \usepackage{fullpage}.
$\usepackage{amsfonts}$

Used for displaying symbols such as the natural number symbol ($\mathbb{N}$), the real number symbol($\mathbb{R}$) and the integer symbol ($\mathbb{Z}$).

## 3.6.2. Macros¶

Code Meaning
\def\eq1{y=\frac{x}{3x^2+x+1}}

\eq1 is the name of the equation (can be anything, but not a preset name). The use of this equation is $\eq1$. The macros are positioned in the preamble after \documentclass and before \begin{document}.
\def\labelaxes{Remember, remember the fifth of November}

\labelaxes is the name of the string (can be anything, but not a preset name). The use of this string is $\labelaxes$. The macros are positioned in the preamble after \documentclass and before \begin{document}.

## 3.6.3. Graphics¶

Code Meaning
\usepackage{graphicx}

Can also centre the image \includegraphics[width=5in]{quad1.png}
\includegraphics{quad1.png}

Use of graphix package to display an image. Will look for the file in the same directory as the .tex file. Can only use .png, .jpg, .gif or .pdf files (not sure - we can also use .eps?)
\includegraphics[width=5in]{quad1.png}

Use of graphix package to display an image, specifying the width.
\begin{center}

\includegraphics[scale=0.5]{quad1.png}

\includegraphics[angle=45]{quad1.png}