What does this function do in matlab?

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Say I have D = D(somevector);
and A = A(:,somevector);
Does the former make this a column? What is it doing if not? Does the latter make a matrix A in some arrangement?
Please provide a link to where I can read more about this. I have been web surfing for too long.
Cheers, Neo!

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James Tursa
James Tursa 2016-2-2
编辑:James Tursa 2016-2-2
See the link on indexing:
In particular, if you supply only one subscript as in your first example, then MATLAB will use what is known as "Linear Indexing" in the link, and give you a column vector as a result with the elements being composed of the linear indexed elements you specified with somevector.
In your second example, you supplied two indexes. The result will be a sub-matrix composed of all the rows (via the : supplied for the first index), and the columns supplied by your somevector.
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Neo
Neo 2016-2-3
Thanks Walter. I would've accepted your answer but you left it as a comment!
-Cheers Neo

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