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Question: Use the command 'matrix' to define a matrix, and how to call the first row elements of the matrix?

Question:Use the command 'matrix' to define a matrix, and how to call the first row elements of the matrix?

Li Zhinan 10 Maple 18
matrix
March 07 2017
2

Use the command 'matrix' to define a matrix, and how to call the first row elements of the matrix?

This method

a:=matrix([[1,2,3],[4,5,6],[7,8,9]]);

a[1..2,-2..-1], does not work? Why？
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