Question

HHow do you create arrays of other arrays, but only including certain rows or columns in MATLAB?

a) Using the reshape() function
b) Using the cat() function
c) Using the select() function
d) Using indexing and slicing

Answer 1

In MATLAB, to create an array comprising only certain rows or columns of another array, you would use indexing and slicing, not functions like reshape() or cat(). Specify row or column indices of the original array to select and create a new array consisting of these parts.

Step-by-step explanation:

To create arrays of other arrays in MATLAB, but only including certain rows or columns, you would use indexing and slicing. MATLAB allows you to index and slice arrays to extract subsets of an array very efficiently. For instance, if you have a 2D matrix A and you want to create a new array that consists of specific rows or columns of A, you can do so by specifying the indices of the desired rows or columns.

Here is an example:

• To extract the second and fourth rows of matrix A, you could use B = A([2, 4], :).
• To extract the first and third columns, you would use C = A(:, [1, 3]).

Functions like reshape() or cat() are used for other purposes such as changing the shape of an array or concatenating arrays respectively and are not typically used for extracting specific rows or columns.