MATLAB® and Its Applications in Engineering: [Based on MATLAB 7.5 (R2007b)] by Raj Kumar Bansal, Ashok Kumar Goel, Manoj Kumar Sharma
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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.
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Operators and Elementary Operations
The MATLAB ® language uses many common operators and special characters that you can use to perform simple operations on arrays of any type. See MATLAB Operators and Special Characters for a comprehensive summary.
Operator Basics
- MATLAB Operators and Special Characters
- Operator Precedence
- Array vs. Matrix Operations
- Compatible Array Sizes for Basic Operations
- Arithmetic Operations Addition, subtraction, multiplication, division, power, rounding
- Relational Operations Value comparisons
- Logical (Boolean) Operations True or false conditions
- Set Operations Unions, intersection, set membership
- Bit-Wise Operations Set, shift, or compare specific bit fields
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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1.1: Operators and Special Characters
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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.
Related Topics
- Define Arithmetic Operators
- Methods That Modify Default Behavior
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IMAGES
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COMMENTS
MATLAB operators that contain a period always work element-wise. The period character also enables you to access the fields in a structure, as well as the properties and methods of an object. ... Uses: Cell array assignment and contents. Description: Use curly braces to construct a cell array, or to access the contents of a particular cell in a ...
Description. The colon is one of the most useful operators in MATLAB ® . It can create vectors, subscript arrays, and specify for iterations. = fix(k-j). If j and k are both integers, then this is simply [j,j+1,...,k]. x = j:i:k creates a regularly-spaced vector x using i as the increment between elements.
The assignment operator is the equals sign (=), used like so: >> x = 6 * 7 x = 42. ... MATLAB responds with the variable name and the computed value. There are a few rules when assigning variables a value. In every assignment statement, the left side has to be a legal variable name. The right side can be any expression, including function calls.
Operators and Elementary Operations. Arithmetic, relational, and logical operators, special characters, rounding, set functions. The MATLAB ® language uses many common operators and special characters that you can use to perform simple operations on arrays of any type. See MATLAB Operators and Special Characters for a comprehensive summary.
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 ...
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."
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.
When an expression is not explicitly assigned to a variable with the assignment operator ( = ), MATLAB automatically stores the result in the special variable ans. ... Column vectors can also be created by applying MATLAB's transpose operator ' (prime) to a row vector. For example >> [1 2 3]' produces
Assignment operators 1:10, Arrays 40:00, creating a vector with constant spacing (with colon) 44:00, Creating a vector with constant spacing by specifying th...
The equals sign (=) in MATLAB is the assignment operator, meaning that the expression on the right of the equals sign is assigned to the variable on the left. So, when you enter x = 3+4, MATLAB first evaluates 3+4 and then assigns the result (7) to the variable x.
Precedence of AND and OR Operators. MATLAB always gives the & operator precedence over the | operator. Although MATLAB typically evaluates expressions from left to right, the expression a|b&c is evaluated as a|(b&c).It is a good idea to use parentheses to explicitly specify the intended precedence of statements containing combinations of & and |.. The same precedence rule holds true for the ...
0. 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.
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]
Operators and Elementary Operations. Arithmetic, relational, and logical operators, special characters, rounding, set functions. The MATLAB ® language uses many common operators and special characters that you can use to perform simple operations on arrays of any type. See MATLAB Operators and Special Characters for a comprehensive summary.
In this video you will be able to get the information about the following concepts and MATLAB tools:1. What do you understand by the term Variable in Program...
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 (replacement) operator. 1.1: Operators and Special Characters.
val can have any data type, and can include MATLAB expressions. If the value of the variable requires evaluation, MATLAB evaluates the expression in the function that contains the call to assignin, not in the workspace specified by ws. If val is a function handle, it must be evaluable in the function that calls assignin. Example: 5. Example ...
MATLAB ® represents Boolean data using the logical data type. This data type represents true and false states using the numbers 1 and 0, respectively. Certain MATLAB functions and operators return logical values to indicate fulfillment of a condition. You can use those logical values to index into an array or execute conditional code.
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.
23. One line conditional assignment: a(a > 5) = 2; This is an example of logical indexing, a > 5 is a logical (i.e. Boolean or binary) matrix/array the same size as a with a 1 where ever the expression was true. The left side of the above assignment refers to all the positions in a where a>5 has a 1.
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 ...