Matlab question about indices of arrays being vectors.

[cirthix]

>> fake_matrix=ones(5), fake_vector=ones(2,1), fake_matrix(fake_vector), fake_matrix(fake_vector(1), fake_vector(2))

fake_matrix =

1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1


fake_vector =

1
1


ans =

1
1


ans =

1

Why does one give a scalar result and the other a vector?

 

[thatolchestnut]

The second gives you a scalar because you are asking for the value stored at a certain location of a matrix think: matrix(y, x) like a coordinate.

The first gives you the a "vector" because you are asking for multiple components. In this case you are asking for the 1st element in the matrix 2 times (if you treat the matrix as a list rather than as a matrix.

In the future, its helpful to not use a uniform matrix when looking at these questions.