How index using inequalities

Hello guys, I was doing this exercise and when I tried running my script, errors appeared.

Create a 1*100 vector A with random numbers from 0 to 10

A = randi([0,10],1,100)

Display all the numbers in A that are greater than 5

u = disp(A>5)

Delete all the numbers in A that are greater than 5

u = []

Answer 1

[Walter Roberson]

A>5 creates a logical vector, with each entry being true if the corresponding A was (strictly) greater than 5, and false if the corresponding A was less than or equal to 5.

disp(A>5) would display that logical vector.

To display the contents of A where A > 5 you need to use A>5 to select entries out of A using logical indexing.

SomeArray(logical_mask)

However... disp() does not return any value, and it is an error to attempt to assign disp() to a variable.

u = []

If you had assigned u the parts of A that are greater than 5, then u = [] would just empty out that array, without changing A. You again want to use logical indexing

SomeArray(logical_mask) = []

[Danny Maefengea]

thank you sir. So just need to put A inplace of "SomeArray" right?

[Walter Roberson]

Well you will need to define the logical_mask as well.

[Danny Maefengea]

oh okay thanks