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

Recall that a matrix is a list of lists with 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 the 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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