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- symbolic variable and assignment operator
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2.8. Assignment Statement
General form of an assignment statement is given as follows:
When an assignment statement is executed, the value of the expression to the right of the equality sign is first computed and the result obtained is assigned to the variable mentioned on the left of the equality sign.
Example 2.5.
| Illustrate the use of an assignment statement. Solution: Consider the following MATLAB statement: To evaluate the expression (x + 2), 2 is added to the value of variable x. The result of computation is then assigned to variable y. |
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MATLAB Operators and Special Characters
This page contains a comprehensive listing of all MATLAB ® operators, symbols, and special characters.
Arithmetic Operators
| Symbol | Role |
|---|---|
Addition | |
Unary plus | |
Subtraction | |
Unary minus | |
Element-wise multiplication | |
Matrix multiplication | |
Element-wise right division | |
Matrix right division | |
Element-wise left division | |
Matrix left division (also known as ) | |
Element-wise power | |
Matrix power | |
Transpose | |
Complex conjugate transpose |
Relational Operators
| Symbol | Role |
|---|---|
Equal to The character is for assignment, whereas the character is for comparing the elements in two arrays. | |
Not equal to | |
Greater than | |
Greater than or equal to | |
Less than | |
Less than or equal to |
Logical Operators
| Symbol | Role |
|---|---|
Find logical AND | |
Find logical OR | |
Find logical AND (with short-circuiting) | |
Find logical OR (with short-circuiting) | |
Find logical NOT |
Special Characters
| Symbol | Role |
|---|---|
Create anonymous functions and function handles, call superclass methods | |
Decimal point, element-wise operations, indexing | |
Line continuation | |
Separate row elements in an array, array subscripts, function input and output arguments, commands entered on the same line | |
Vector creation, for-loop iteration, indexing | |
Separate rows in an array creation command, suppress output of a line of code | |
Operator precedence, function argument enclosure, indexing | |
Array construction and concatenation, empty matrix creation, element deletion, multiple output argument assignment | |
Create cell array, indexing | |
Code comments, conversion specifier | |
Block of comments that extend beyond one line | |
Issue operating system command | |
Retrieve metaclass information for class name | |
Create character array | |
Create string | |
Represent logical NOT, suppress specific input or output arguments. | |
Variable creation and indexing assignment. The character is for assignment, whereas the character is for comparing the elements in two arrays. | |
Specify one or more superclasses in a class definition. | |
Specify the fields of a name-value structure as the names of all writeable properties of the class. |
String and Character Formatting
Some special characters can only be used in the text of a character vector or string. You can use these special characters to insert new lines or carriage returns, specify folder paths, and more.
Use the special characters in this table to specify a folder path using a character vector or string.
| : Slash and Backslash : File or folder path separation : In addition to their use as mathematical operators, the slash and backslash characters separate the elements of a path or folder. On Microsoft Windows based systems, both slash and backslash have the same effect. On The Open Group UNIX based systems, you must use slash only.
On a Windows system, you can use either backslash or slash: ]) dir([matlabroot '/toolbox/matlab/elmat/shiftdim.m']) On a UNIX system, use only the forward slash: ]) |
: Dot dot : Parent folder : Two dots in succession refers to the parent of the current folder. Use this character to specify folder paths relative to the current folder.
To go up two levels in the folder tree and down into the folder, use:
| |
: Asterisk : Wildcard character : In addition to being the symbol for matrix multiplication, the asterisk is used as a wildcard character. Wildcards are generally used in file operations that act on multiple files or folders. MATLAB matches all characters in the name exactly except for the wildcard character , which can match any one or more characters.
Locate all files with names that start with and have a file extension: ) | |
: At symbol : Class folder indicator : An sign indicates the name of a class folder.
Refer to a class folder:
| |
: Plus : Namespace directory indicator : A sign indicates the name of a namespace folder.
Namespace folders always begin with the character: +myfolder/@myClass % class folder in a namespace
|
There are certain special characters that you cannot enter as ordinary text. Instead, you must use unique character sequences to represent them. Use the symbols in this table to format strings and character vectors on their own or in conjunction with formatting functions like compose , sprintf , and error . For more information, see Formatting Text .
| Symbol | Effect on Text |
|---|---|
Single quotation mark | |
Single percent sign | |
Single backslash | |
Alarm | |
Backspace | |
Form feed | |
New line | |
Carriage return | |
Horizontal tab | |
Vertical tab | |
Hexadecimal number, | |
Octal number, |
Related Topics
- Array vs. Matrix Operations
- Array Comparison with Relational Operators
- Compatible Array Sizes for Basic Operations
- Operator Precedence
- Find Array Elements That Meet Conditions
- Greek Letters and Special Characters in Chart Text
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Operator Overloading
Why overload operators.
By implementing operators that are appropriate for your class, you can integrate objects of your class into the MATLAB ® language. For example, objects that contain numeric data can define arithmetic operations like + , * , - so that you can use these objects in arithmetic expressions. By implementing relational operators, you can use objects in conditional statements, like switch and if statements.
How to Define Operators
You can implement MATLAB operators to work with objects of your class. To implement operators, define the associated class methods.
Each operator has an associated function (e.g., the + operator has an associated plus.m function). You can implement any operator by creating a class method with the appropriate name. This method can perform whatever steps are appropriate for the operation being implemented.
For a list of operators and associated function names, see MATLAB Operators and Associated Functions .
Object Precedence in Operations
User-defined classes have a higher precedence than built-in classes. For example, suppose q is an object of class double and p is a user-defined class. Both of these expressions generate a call to the plus method in the user-define class, if it exists:
Whether this method can add objects of class double and the user-defined class depends on how you implement the method.
When p and q are objects of different classes, MATLAB applies the rules of precedence to determine which method to use.
For more information on how MATLAB determines which method to call, see Method Invocation .
Operator Precedence
Overloaded operators retain the original MATLAB precedence for the operator. For information on operator precedence, see Operator Precedence .
Sample Implementation — Addable Objects
The Adder class implements addition for objects of this class by defining a plus method. Adder defines addition of objects as the addition of the NumericData property values. The plus method constructs and returns an Adder object whose NumericData property value is the result of the addition.
The Adder class also implements the less than operator ( < ) by defining a lt method. The lt method returns a logical value after comparing the values in each object NumericData property.
Using a double converter enables you to add numeric values to Adder objects and to perform addition on objects of the class.
Add two objects:
Add an object with any value that can be cast to double:
Compare objects a and b using the < operator:
Ensure that your class provides any error checking required to implement your class design.
MATLAB Operators and Associated Functions
The following table lists the function names for MATLAB operators. Implementing operators to work with arrays (scalar expansion, vectorized arithmetic operations, and so on), can also require modifying indexing and concatenation. Use the links in this table to find specific information on each function.
Operation | Method to Define | Description |
|---|---|---|
|
| Binary addition |
|
| Binary subtraction |
|
| Unary minus |
|
| Unary plus |
|
| Element-wise multiplication |
|
| Matrix multiplication |
|
| Right element-wise division |
|
| Left element-wise division |
|
| Matrix right division |
|
| Matrix left division |
|
| Element-wise power |
|
| Matrix power |
|
| Less than |
|
| Greater than |
| Less than or equal to | |
| Greater than or equal to | |
| Not equal to | |
| Equality | |
| Logical AND | |
| Logical OR | |
| Logical NOT | |
|
| Colon operator |
|
| Complex conjugate transpose |
|
| Matrix transpose |
|
| Horizontal concatenation |
| (a,b,...) | Vertical concatenation |
|
| Subscripted reference |
|
| Subscripted assignment |
|
| Subscript index |
Related Topics
- Define Arithmetic Operators
- Methods That Modify Default Behavior
MATLAB Command
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Run the command by entering it in the MATLAB Command Window. Web browsers do not support MATLAB commands.
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MATLAB - overload assignment operator
Suppose I have the following class:
Then suppose I have the following calls:
n will be a handle to the same object as m is, of course. Is there a way to overload the assignment operator? In particular, I wonder if I can have something like the following method:
So doing n = m would act the same as n = m.A .
2 Answers 2
I don't think you can: just imagine how you would assign the object itself to a variable, it would be the exact same syntax. And since you can't have ambiguities for a program to be executable, it is very unlikely to be possible and useful.
If you'd just want it as syntactic sugar, learn to live with the limitations. Otherwise you might want to take another look at your design.
It's not possible to overload the = operator to do this.
But (as you probably realised) there's no reason why you can't implement your assign method as you have done, and then call n = assign(m) .
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IMAGES
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COMMENTS
Learn how to use various operators, symbols, and special characters in MATLAB, such as arithmetic, relational, logical, and array operators. The apostrophe (') is used for transpose, complex conjugate transpose, and string concatenation.
Convert Data Types with Indexed Assignment. If you perform an indexed assignment to an existing array, MATLAB keeps the previous state of the array whenever possible. MATLAB converts the new values on the right side of the assignment operator to the existing data type of the array on the left side.
An assignment statement is used to assign a value to a variable name. Once the value has been assigned, the variable name can be used instead of the value. Matlab allows a variable to be assigned to a single scalar value, or an array of values. You will learn more about arrays in later lessons. The = sign is the assignment operator in Matlab ...
When you write. v1(v1 < 5) the result of the expression gets assigned to ans. So the above is really a shortcut for. ans = v1(v1 < 5) And now we can see the difference between this statement and. v1(v1 < 5) = 1. In the first statement, the indexing happens on the right side of the assignment operator.
Assignment Statements. You can create your own variables, and give them values, with an assignment statement. The assignment operator is the equals sign (=), used like so: >> x = 6 * 7 x = 42. This example creates a new variable named x and assigns it the value of the expression 6 * 7. MATLAB responds with the variable name and the computed value.
Learn how to use various operators and special characters in MATLAB, such as arithmetic, matrix, exponentiation, division, colon, parentheses, brackets, decimal point, ellipsis, comma, semicolon, percent sign, quote sign, transpose and assignment. See the command effect and syntax for each operator and character.
Learn how to use assignin to assign values to variables in specified workspaces, such as base or caller. See examples of exporting data, changing input arguments, and assigning function handles.
Remember that = is the assignment operator, and means "gets", whereas == means "is equal to". ... Matlab has lots of extremely useful builtin functions. Typically, there are three things involved in calling a function: the function name, its arguments , and its return value . ...
symbolic variable and assignment operator . Learn more about symbolic variable and assignment operator
2.8. Assignment Statement General form of an assignment statement is given as follows: variable_name = expression; When an assignment statement is executed, the value of the expression to the right … - Selection from MATLAB® and Its Applications in Engineering: [Based on MATLAB 7.5 (R2007b)] [Book]
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.
In MATLAB, y = y + 1 is a sensible and useful assignment statement. It reads the current value of y, adds 1, and replaces the old value with the new value. >> y = 1; >> y = y + 1 y = 2. When you read MATLAB code, you might find it helpful to pronounce the equals sign as "gets" rather than "equals."
Learn how to use the colon operator (:) to create vectors, subscript arrays, and specify for-loop iterations in MATLAB. See examples of unit-spaced, regularly-spaced, and indexing vectors, and how to reshape matrices with the colon operator.
Learn how to use arithmetic, relational, and logical operators in MATLAB expressions and how to override the default precedence levels with parentheses. See the list of operators sorted by precedence level and examples of array and matrix operations.
Use the special characters in this table to specify a folder path using a character vector or string. /. \. Name: Slash and Backslash. Uses: File or folder path separation. Description: In addition to their use as mathematical operators, the slash and backslash characters separate the elements of a path or folder.
Predefined Input Functions. gensig: Generates a periodic sine, square, or pulse input. sawtooth: Generates a periodic sawtooth input. square: Generates a square wave input. stepfun: Generates a step function input. A Summary of MATLAB commands and functions is attached.
Open in MATLAB Online. for-loops automatically increment and any reassignment inside the loop will be reset at the next increment: Theme. Copy. for ii = 1:10. disp (ii) ii = 5000; end. To be able to toy with the counter use a while loop and to the assignment manually.
Unfortunately there are no increment and compound assignment operators in Matlab. I also remember reading posts by employees at Mathworks saying that they don't intend to add such operators to Matlab. Steve Lord's reply to the following question illustrates the difficulties involved (way down, ...
Operator Overloading Why Overload Operators. By implementing operators that are appropriate for your class, you can integrate objects of your class into the MATLAB ® language. For example, objects that contain numeric data can define arithmetic operations like +, *, -so that you can use these objects in arithmetic expressions. By implementing relational operators, you can use objects in ...
It's not possible to overload the = operator to do this. But (as you probably realised) there's no reason why you can't implement your assign method as you have done, and then call n = assign(m). answered Nov 22, 2011 at 12:53. Sam Roberts. 24.1k 1 41 64.