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**Lecture 4 MATLAB Windows Arithmetic Operators Maintenance Functions**

Basic Math Functions Help/Doc Scripts P: Drive Comments

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**Fundamental components of MATLAB**

MATLAB stands for Matrix Laboratory MATLAB = a calculator + a lot more A computing system that interprets one instruction at a time. Instructions MUST conform to a specific syntax and vocabulary. A large library of modules that provide high-level capabilities for processing data. A collection of toolboxes, some providing graphical capabilities. A graphical user interface (GUI) to allow you to assemble your own professional looking software.

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**Double Click to bring up the MATLAB Interface**

Starting MATLAB Opening MATLAB in LB172: computer should have a direct shortcut on the desktop Any other LAB on campus, search: If not, use Ernie (directions online) Double Click to bring up the MATLAB Interface

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**DO NOT USE CITRIX IN THE LAB**

Why? …

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**None of these are helpful to write re-usable code.**

“Workspace” “The Command Window” “Current Directory” Shows the variables that have been created. “Your Calculator Screen” You can do exactly as on your calculator: add, subtract, divide, multiple, use parentheses to override the order of operations… Later on, you will realize you can do a LOT more in this frame. This frame shows the files (excel, text, MATLAB files) that can immediately be used. “Command History” It will show all the commands executed previously. None of these are helpful to write re-usable code.

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**1. Basic Data Manipulation**

Starting MATLAB leads to the prompt symbols >> in the command window If you don’t see the prompt symbols, MATLAB is busy MATLAB is loading MATLAB is doing 1,000,000 calculations… MATLAB has crashed MATLAB is stuck

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**Overview: most Operators**

There are 3 primary groups of operators One operator is very different in programming compared to math 1. ARITHMETIC + Addition - Subtraction * Multiplication /,\ Division ^ Exponentiation, i.e. “To the power of” 2. RELATIONAL < strictly less than > strictly greater than <= less than or equal to >= greater than or equal to == is equal to ~= is not equal to 3. BOOLEAN && “AND” || “OR” ~ “NOT” = “the assign operator”

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MATLAB as a Calculator The MATLAB command window can be used as a boring old calculator. Precedence is similar to most calculators with a few MATLAB specific things. Left to right based on these things: Operator Symbol Description ( ) Parenthesis ' ^ Transpose (M.O.T.L.) and Power + - Signage (Positive/Negative), not Addition/Subtraction (yet) * / \ Multiplication & Division + - Addition & Subtraction : Colon (More on this later) Relational Operators (More on this later) Logical Operators (More on this later) 8

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**MATLAB as a Calculator Mistake you’ll make at least once!**

Power is before signage: -3^2 is different than (-3)^2 Operator Symbol Description ( ) Parenthesis ' ^ Transpose (More on this later) and Power + - Signage (Positive/Negative), not Addition/Subtraction (yet) * / \ Multiplication & Division + - Addition & Subtraction : Colon (More on this later) Relational Operators (More on this later) Logical Operators (More on this later) 9

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**Demo MATLAB as a calculator in the command window (without variables)**

Any single line contains a command/statement/instruction (different words for the same concept) The ans variable is the default location where MATLAB stores results.

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**Maintenance Functions**

clear clc close all commandwindow

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Basic Math Functions sin cos tan sind sqrt abs help vs. doc help elfun

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the “Editor” “Open a new script file"

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**A new window: the Editor**

This is where you’ll create a “script file” Save these type of files (on your P:/ drive ) absolutely re-usable

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**A new window: the Editor**

“Dock” this window to make it part of the regular windows below

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Final common setup! 16

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**2. Run your statements (or hit F5)**

How to write “code”… 2. Run your statements (or hit F5) 3. See your results here 1. Type your statements, your code, your instructions,… here (Modify your statements, repeat cycle)

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P: Drive The P: drive is space provided by ERAU that you can access from any ERAU computer. Getting files from your P: drive to your personal computer can be done through ERNIE/Citrix/Network File Access, but all the transferring must be done from within that program and it is sometimes grouchy.

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**Comments Comments are the most important part of your code.**

Put the algorithm steps (7a) in comments before you start Write the code that goes with the comments Update the comments to make them more detailed where needed. Someone else should be able to write your code based on your comments. % <- Supported by all versions of MATLAB %{ <- Must not have anything else on the line with open/close %} (Not supported in versions before 7/R14/2004)

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**Lessons learned New Vocabulary Command window Workspace**

Current Folder/Current Directory Command History Command Statements Instructions Prompt symbols Script file

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