x = [12 54 21 36 27 19 16 78 65 43 38 91 5 8 3 18] how can i find elements of x (the values of x) such that xi<=30 and 30<=xi<=50

 x = [12 54 21 36 27 19 16 78 65 43 38 91 5 8 3 18] how can i find elements of x (the values of x) such that  xi<=30 and  30<=xi<=50

Answer 1

[Jon]

Look at the find() function. You can use logical operators like < , > , and = . Just try some things and see what happens.

[Waleed Alrabghi]

W = find(x<=30) is it correct ?

[Torsten]

Why not just testing it ?

Many big inventions would not have been possible without the curiosity of the people engaged in the subject.

Best wishes

Torsten.

Answer 2

[Jan]

A further hint: "30<=xi<=50" might be misleading, because Matlab processes such terms from right to left. Therefore you need to connect the two relations by an and():

30 <= x & x <= 50