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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?

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Melecia Senior
Melecia Senior 2021-4-13
回答： Steven Lord 2021-4-13
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?

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Atsushi Ueno
Atsushi Ueno 2021-4-13
>> 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

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Steven Lord
Steven Lord 2021-4-13
Ran in:
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

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