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5.49.12  Extracting element(s) of a matrix: [] at

Recall that a matrix is a list of lists with the same size.
Input:

A:=[[3,4,5],[1,2,6]]

Output:

[[3,4,5],[1,2,6]]

The prefixed function at or the index notation [...] is used to access to an element or a row or a column of a matrix:

You may also assign an element of a matrix using index notation, if you assign with := a new copy of the matrix is created and the element is modified, if you assign with =<, the matrix is modified in place.


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