Representing logical true and false, MATLAB in Statistics

Assignment Help:

Representing Logical true and False:

It has been stated that expressions which are theoretically true really have the integer value of 1, and expressions which are theoretically false really have the integer value of 0.Exhibiting the concepts of logical true and false in the MATLAB is somewhat different: the concept of false is presented by the integer value of 0, but the concept of true can be presented by any non-zero value (not merely the integer 1). This can lead to a few strange Boolean expressions. For illustration, consider the following if statement:

>> if 5

disp('Yes, this is true!')

end

Yes, this is true!

As 5 is a nonzero value, it is a way of telling true. And hence, when this Boolean expression is computed, it will be true, therefore the disp function will be executed and "Yes, this is true" is exhibited. Obviously, this is a pretty bizarre if the statement, one that hopefully would not ever be encountered!

Though, a simple mistake in an expression can lead to this type of answer. For illustration, let's state that the user is prompted for the choice of Y or N for a yes/no question:

letter = input('Choice (Y/N): ','s');

In the script we might want to execute a specific action if the user responded with 'Y'. Nearly all scripts would permit the user to enter either lower- or uppercase (example, either 'y' or 'Y') to specify yes. The appropriate expression that would return true if the value of letter was 'y' or 'Y' would be

letter == 'y' || letter == 'Y'

Though, if by fault this was written as:

letter == 'y' || 'Y'

this expression would  forever be true, regardless of the value of the variable letter. This is as 'Y' is a nonzero value; therefore it is a true expression. The first section of the expression might be false, but as the second expression is true the whole expression would be true.


Related Discussions:- Representing logical true and false

If statement - matlab programming, The IF Statement: The if statement ...

The IF Statement: The if statement selects whether or not the other statement, or group of statements, is executed. The common form of the if statement is as shown below: i

Graphics objects, Graphics objects: The objects involve graphics primit...

Graphics objects: The objects involve graphics primitives like lines and text, and also the axes used to orient the objects. These objects are organized hierarchically, and the

Illustration of indexing into vectors of structures, Illustration of Indexi...

Illustration of Indexing into vectors of structures: For illustration, the function to print the information from packages has been modified therefore in addition to the vecto

Median, Median The median is defined only for a data set which has been...

Median The median is defined only for a data set which has been sorted first, that means that the values are in order. The median of a sorted set of data values (n) is defined

Input in a while loop, Input in a While Loop: The script below repeats...

Input in a While Loop: The script below repeats the procedure of prompting a user, the reading in a positive number, and echo-printing it, as long as the user properly enters

Illustration of nested loops, Illustration of Nested loops: Running th...

Illustration of Nested loops: Running the script shows the output: >> printstars ***** ***** ***** The variable rows identifies the number of rows to print, and

Logical errors, Logical errors: The Logical errors are more complicate...

Logical errors: The Logical errors are more complicated to locate, as they do not result in any error message. The logical error is a mistake in reasoning by the programmer, b

Functions which complete a task without returning values, Functions which c...

Functions which complete a task without returning Values: Most of the functions do not compute values, but instead of accomplish a task like printing formatted output. As thes

Help function, Help function: Function is computing the two values, th...

Help function: Function is computing the two values, there are two output arguments in the function header (i.e., area & circum), that are placed in the square brackets [ ]. A

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd