Question

given rowex = [-2, -1, 0, 1]. type numeric arrays as [1, 2, 3] and logical arrays as [true, false, false]. if appropriate, type: error Write a statement that writes the second and third elements of rowEx to variable x, using a logical indexing array.

Answer 1

To select the second and third elements of an array 'rowEx' using a logical indexing array, the logical array [false, true, true, false] should be applied, resulting in a new array 'x' with the elements [-1, 0].

Step-by-step explanation:

The student has asked to write a statement that selects the second and third elements from an array rowEx using a logical indexing array. In most programming environments that support logical indexing, such an array can be used to select elements of another array where the logical value is true. Given rowEx = [-2, -1, 0, 1], we want to select the second and third elements, which corresponds to the logical array [false, true, true, false].

The code to extract the second and third elements of rowEx to variable x using logical indexing would be something akin to:

x = rowEx([false, true, true, false]);

This statement creates a new array x that consists of the elements from rowEx where the corresponding index in the logical array is true.

Hence, x will be [-1, 0], which are the second and third elements of the original array.