2016-01-01 15:29:20 -0800 (PST), Nils Bruin:

You are correct: AC is a 2-by-1 matrix, and AC[0] selects the first row. 
> You can select the appropriate elements via
>
> a = AC[0,0]
> b = AC[1,0]
>
> or
>
> a = AC[0][0]
> b = AC[1][0]
>

I would recommend the first syntax,

a = AC[0,0]

which just accesses the given element, and so it is faster than

a = AC[0][0]

which would create the vector AC[0] and then get its index 0 coordinate.

Moreover, if you want to change an element of a matrix, writing

AC[0,0] = 9

will work, while

AC[0][0] = 9

will fail.

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