# Arithmetic and logical binary operations in matlab

Then you can write:. Back to the top Conditional statements Where these logical statements become useful is when they can be used to control the flow of a program. These arrays in turn can be used to index into the original array and mask certain elements. Do you want to try the above code fragments on your own? Policies and guidelines Contact us.

Spatial domain filtering, part I 9. Logical operators Another key concept in programming is the ability to test a conditional statement and make decisions about the flow of the program based on the truth value of the statement. In the case of integer images, the logical operator is normally applied in a bitwise arithmetic and logical binary operations in matlab. For example, we can pull out only the positive entries of x:

Two common ways of doing this are the "any" and the "all" functions. You might first check to see that the divisor is not equal to 0. In other languages Add links. A function call any array will return true if array contains any nonzero values and false if all values are zero.

Then you can write:. Horizontal concatenation is done by treating an array as if it were a variable included in a row. Introduction to image processing 2. Another key concept in programming is the ability to test a conditional statement and make decisions about the flow of the program based on the truth value of the statement.

Download the Matlab script that produces this page here. The loop condition should be reducable to a single boolean value, T or F, not an array. Back to the top Using logical operators with arrays These relational tests, when used with Matlab arrays, produce another array whose entries are '0' where the relational test is false, and '1' where the relational statement is true. The interesting part is of course applying some operations on those arithmetic and logical binary operations in matlab.

In Matlab, "true" is integer 1 and "false" is the integer 0. The real roots are: For example, consider the following code fragment:

In finite precision arithmetic, we cannot compute the exact value of the function cos x. The first statement x will only be true if all entries of x are negative. It is also possible to access blocks of matrices using the colon:

The Matlab find function will return for us an array of indices at which some logically array is set to true. Introduction to image processing 2. Retrieved from " https: Image arithmetic applies one of the standard arithmetic operations or a logical operator to two or more images. Sometimes, you may want to know the indices of the entries in an array that meet some criteria.

This operator is like a wildcard; it tells MATLAB that you want all elements of a given dimension or with indices between two given values. In addition to index addressing, you can also access only elements arithmetic and logical binary operations in matlab an array that satisfy some logical criterion. Back to the top Using arrays in conditional statements We can also use conditional statements in arrays. But in fact, all it does is set the array x to the scalar value If you desire to multiply or divide two matrices or vectors component-wise, or to raise all components of one matrix to the same power, rather than using matrix definitions of these operators, you can use the dot.

Now that you know how to define a simple array, you should know how to access its elements. The column major mode is the same as in Fortran, and the contrary of the order in the C language. Resizing image -- Resizing Image Test 4.