Representing logical true and false, MATLAB in Statistics

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.

Posted Date: 10/19/2012 3:17:47 AM | Location : United States







Related Discussions:- Representing logical true and false, Assignment Help, Ask Question on Representing logical true and false, Get Answer, Expert's Help, Representing logical true and false Discussions

Write discussion on Representing logical true and false
Your posts are moderated
Related Questions
Program of Persistent variables: The program below elaborates this. The script calls a function func1 that initializes a variable count to 0, then increment it, and print the

Illustration of Input in a for loop: In this illustration, the loop variable iv iterates through the values 1 through 3, therefore the action is repeated three times. The acti

Polynomials: Simple curves are polynomials of various degrees, or orders. The degree is the integer of the highest exponent in the expression. The illustrations are as follows

Steps for input output functions - Lower level file: The steps involved are as shown below:  Open the file.  Read the file, write to the file, or append to the file.

Example of Mode When no value appears more often than any other, the smallest value in the vector will be the mode of the vector. >> shortx = [2 5 1 4]; >> mode(shortx

Rectangle - graphics objects: The other core graphics object is the rectangle that can have curvature added to it (!!). Merely calling the function rectangle without any argum

Types of errors: There are some various kinds of errors which can occur in a program, that fall into the categories of run-time errors, syntax errors, and logical errors. T

#qYou will need to examine two of the nine sections of data: one section of qualitative data (choose either Gender or Position) one section of quantitative data (choose either Intr

Working of Editor and debugger: Editor/Debugger, or commands can be typed from Command Window. For illustration, the dbstop command below will set a breakpoint in the fifth li

Statistics There are numerous statistical analyses which can be executed on data sets. In MATLAB software, the statistical functions are in the data analysis help topic known a