Hi, I want to write a code that locates the nth value of matrix x= [2,4,6,8,1​0,12,14,16​,18,20] where n is [1:10]. How could I write that?

Hi, I want to write a code that locates the nth value of matrix x= [2,4,6,8,10,12,14,16,18,20] where n is [1:10]. How could I write that?

Answer 1

[Atsushi Ueno]

>> x= [2,4,6,8,10,12,14,16,18,20];

>> x(1:10)

ans =

2 4 6 8 10 12 14 16 18 20

>> n=[1:10];

>> x(n)

ans =

2 4 6 8 10 12 14 16 18 20

Answer 2

[Steven Lord]

That's basic linear indexing. See the "Indexing with a Single Index" section on this documentation page for more information.

x = 2:2:20

x = 1×10

2 4 6 8 10 12 14 16 18 20

n = 1:5

n = 1×5

1 2 3 4 5

y = x(n)

y = 1×5

2 4 6 8 10

z = x(3:8)

z = 1×6

6 8 10 12 14 16