What does this colon mean here?

[a_sorted, a_order] = sort(A);

newB = B(a_order,:);

This is a few commands that I found on here and I am unsure of what the colon in the second line means. I am trying to sort a vector based on how I sorted another vector and I stumbled across the code above. does this accomplish what I am trying to do, and how do I use the colon in this case for future reference?

Answer 1

[Image Analyst]

Colon means "all". Since it's in the columns place of the matrix, B(a_order, :) means "take all columns of the rows specified by a_order).

This will sort the rows of B in exactly the same way vertically as the rows of A were sorted.

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[Muhammad Manzoor]

thank you