What do brackets mean in this expression, y(Z)?

>>%Hi:

>>y = [1; 2; 3; 1; 2; 3; 1; 2; 3];

>>Z=[1 1 2; 2 1 1; 1 1 4];

>>y(Z)

ans =

 1 1 2

 2 1 1 

 1 1 1

>>%But I have no idea what the () operation is. I see it in some code that I'm trying to figure out. Thanks.

>>Wallace

Answer 1

[Jason Moore]

In this case Z is being used to reference the y array. Since Z is also an array, for each value of Z the y array will be referenced and will return the corresponding value in y. Therefore, the result of this command will also be an array the size of Z

i.e. the first row of your Z array is 1 1 2 So when used in the following command MATLAB is actually returning y(1),y(1),y(2) for your first row of data

[Wallace Yang]

Thank you gentlemen.

[Isaiah Naranjo]

What about the last row?

1 1 1

i can see where y returns y(1),y(1),y(2) for the first row what about the second?

and mainly the third row? where its 1 1 1 instead 1 1 4?

[Wallace Yang]

The last row consists of the 1st element, the 1st element, and the 4th element of the y array (in this case, also a 1).