HP 48gx

Creating Matrices: (£8) (/ATRIX)
You can also enter a matrix in a form similar to its
depiction in books—using the special Matriz Writer entry
feature. It can create either real or complex matrices.
Lessons 20 and 34 contain worked examples using the
MatrixWriter.
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EE EEE ET OES
Introducing the HP 48 2-11