# MATLAB ESSENTIALS FOR BIOMEDICAL ENGINEERS MATLAB is a very important tool for every engineer but it plays a special role in the life of biomedical engineer so i decided to start up on MATLAB in a totally different fashion

First Steps in MATLAB

First of all officially  “MATLAB is a software package that lets you do mathematics and computation, analyse data, develop algorithms, do simulation and modelling, and produce graphical displays and graphical user interfaces.”

GETTING STARTED IN MATLAB

1. To run matlab on a PC double-click on the matlab icon.To run matlab on a unix system, type matlab at the prompt.
2. To end a matlab session type quit or exit at the matlab prompt.
3. You can type help at the matlab prompt, or pull down the Help
4. menu on a PC.When starting matlab you should see a message: To get started, type one of these commands: helpwin,
helpdesk, or demo

>>

NOW HOW TO PERFORM FUNCTIONS IN MATLAB

for adding two numbers just go to command prompt and

just type 1+1

and press enter you will get the output as 2 ; it is as simple as that.

MATLAB gives output as

ans =
2

This  “ans” can be used also as a variable for the further operations.For example you can type

ans*ans
to check that 2 × 2=4

MATLAB  has updated the value of ans to be 4.

Matrices’

The basic object that MATLAB deals with is a matrix. A matrix is an
array of numbers. For example the following are matrices: The size of a matrix is the number of rows by the number of columns.

The ?rst matrix is a 3×3 matrix. The (2,3)-element is one million—1e6
stands for 1 × 106—and the (3,2)-element is pi = ? =3.14159 … .
The second matrix is a row-vector, the third matrix is a column-vector
containing the number i, which is a pre-de?ned matlab variable equal
to the square root of ?1. The last matrix is a 1 × 1 matrix, also called
a scalar.

Variables

Variables in matlab are named objects that are assigned using the
equals sign = .

They are limited to 31 characters and can contain
upper and lowercase letters, any number of ‘_’ characters, and numerals.

They may not start with a numeral. matlab is case sensitive: A
and a are di?erent variables. The following are valid matlab variable
assignments:

a=1
speed = 1500
name = ’biomedin’

invalid assignments:

2for1 = ’yes’
first one = 1 