In Matlab

Real component of a complex scalar, specified as a scalar.

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Data Types: singledouble

Imaginary component of a complex scalar, specified as a scalar.

If b is double, you canuse the character, i, without a multiplicationsign as a suffix in forming the complex numerical constant.

Example: 7i

If b is single, you mustuse a multiplication sign when forming the complex numerical constant.

Example: single(7)*i

Data Types: singledouble

xReal component of complex array
scalarvectormatrixmultidimensional array

Real component of a complex array, specified as a scalar, vector, matrix, or multidimensional array.

The size of x must match the size of y,unless one is a scalar. If either x or y isa scalar, MATLAB® expands the scalar to match the size of theother input.

@ in matlab function

single can combine with double.

Data Types: singledouble

yImaginary component of complex array
scalarvectormatrixmultidimensional array

Imaginary component of a complex array, specified as a scalar, vector, matrix, or multidimensional array.

The size of x must match the size of y,unless one is a scalar. If either x or y isa scalar, MATLAB expands the scalar to match the size of theother input.

single can combine with double.

Data Types: singledouble

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MATLAB environment behaves like a super-complex calculator. You can enter commands at the >> command prompt.

MATLAB is an interpreted environment. In other words, you give a command and MATLAB executes it right away.

Hands on Practice

Type a valid expression, for example,

And press ENTER

When you click the Execute button, or type Ctrl+E, MATLAB executes it immediately and the result returned is −

Let us take up few more examples −

When you click the Execute button, or type Ctrl+E, MATLAB executes it immediately and the result returned is −

Another example,

When you click the Execute button, or type Ctrl+E, MATLAB executes it immediately and the result returned is −

Another example,

When you click the Execute button, or type Ctrl+E, MATLAB executes it immediately and the result returned is −

In Matlab Meaning

Another example,

When you click the Execute button, or type Ctrl+E, MATLAB executes it immediately and the result returned is −

MATLAB provides some special expressions for some mathematical symbols, like pi for π, Inf for ∞, i (and j) for √-1 etc. Nan stands for 'not a number'.

Use of Semicolon (;) in MATLAB

Semicolon (;) indicates end of statement. However, if you want to suppress and hide the MATLAB output for an expression, add a semicolon after the expression.

For example,

When you click the Execute button, or type Ctrl+E, MATLAB executes it immediately and the result returned is −

Adding Comments

The percent symbol (%) is used for indicating a comment line. For example,

In Matlab Language

You can also write a block of comments using the block comment operators % { and % }.

The MATLAB editor includes tools and context menu items to help you add, remove, or change the format of comments.

Commonly used Operators and Special Characters

MATLAB supports the following commonly used operators and special characters −

OperatorPurpose
+Plus; addition operator.
-Minus; subtraction operator.
*Scalar and matrix multiplication operator.
.*Array multiplication operator.
^Scalar and matrix exponentiation operator.
.^Array exponentiation operator.
Left-division operator.
/Right-division operator.
.Array left-division operator.
./Array right-division operator.
:Colon; generates regularly spaced elements and represents an entire row or column.
( )Parentheses; encloses function arguments and array indices; overrides precedence.
[ ]Brackets; enclosures array elements.
.Decimal point.
Ellipsis; line-continuation operator
,Comma; separates statements and elements in a row
;Semicolon; separates columns and suppresses display.
%Percent sign; designates a comment and specifies formatting.
_Quote sign and transpose operator.
._Nonconjugated transpose operator.
=Assignment operator.

Special Variables and Constants

MATLAB supports the following special variables and constants −

NameMeaning
ansMost recent answer.
epsAccuracy of floating-point precision.
i,jThe imaginary unit √-1.
InfInfinity.
NaNUndefined numerical result (not a number).
piThe number π

Naming Variables

Variable names consist of a letter followed by any number of letters, digits or underscore.

In Matlab Operators Work On

MATLAB is case-sensitive.

Variable names can be of any length, however, MATLAB uses only first N characters, where N is given by the function namelengthmax.

Saving Your Work

The save command is used for saving all the variables in the workspace, as a file with .mat extension, in the current directory.

For example,

Ln Function In Matlab

You can reload the file anytime later using the load command.