To count the number of elements in an array that match a condition in MATLAB, you can use the sum() function. The sum() function will count the number of elements in an array that evaluate to true when a condition is applied.
Here's an example of how to use the sum() function to count the number of elements in an array that are greater than 5:
% Create an array
array = [1, 6, 3, 8, 2, 9];
% Count the number of elements greater than 5
count = sum(array > 5);
disp(count); % Output: 3
In this example, the array variable is created with the values [1, 6, 3, 8, 2, 9]. The sum() function is used to count the number of elements in the array variable that are greater than 5, which is 3.
You can also count the number of elements that match a more complex condition using logical operators such as & (AND) and | (OR). Here's an example of how to use logical operators to count the number of elements in an array that are greater than 5 and less than 9:
% Create an array
array = [1, 6, 3, 8, 2, 9];
% Count the number of elements greater than 5 and less than 9
count = sum(array > 5 & array < 9);
disp(count); % Output: 2
In this example, the sum() function is used to count the number of elements in the array variable that are greater than 5 and less than 9, which is 2.