first HP: cannot enter and multiply matrices in mode Home or CASE

If I get two matrices in the catalog of Matrices (Maj 4) I can multiply the

M7 * M8 press on enter and get a 3 x 3 double braket matrix, BUT

If I get the two matrices of same in house or CASES using (SHIFT 5) 3rows 1column "vertical" [[2, -1, 1]] and [1-3 - 2] and try them at multipy I get: "error: invalid dimension ' if I do same in CAS mode I get:" dotvecteur error: invalid dimension.

Once 3 x 1 matrix a matrix 1 x 3 should multiply and did when I enter data and store it as a variable.    Why it does not work when I enter data directly in the registry?

Hello

When a line is entered, it is interpreted as a vector, then your second matrix is a vector.

For matrices with a single line, start by typing [] twice, to get a matrix of rank [[1-3 - 2]].

Best regards.

Tags: Notebooks

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