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 ▼ dennis Junior Member Posts: 23 Threads: 10 Joined: Sep 2011 04-23-2004, 01:08 PM Hello, I have the Hp49G calculator and I have a problem: There is no problem writing [[1,2,3][4,5,6]*[[7,8][9,10][11,12]] and the calculator gives[[58,64][139,154]]. But if the two matrix are two vectors ((n*1) and (1*n)) the multiplication insn't possible. [ERROR: invalid dimension!!!] (instead I should obtain a number). How can I do for solve this operation? ▼ Tom Sherman Member Posts: 95 Threads: 7 Joined: Jan 1970 04-23-2004, 02:36 PM Dennis, Go to the math menu, select the vectors menu, and then select DOT. If you are in RPN mode, you will want to enter your vectors before doing this; if you are in algebraic mode, the vectors are entered after selecting DOT. If you have a manual, see page 8-5. I hope it works for you. Tom ▼ dennis Junior Member Posts: 23 Threads: 10 Joined: Sep 2011 04-24-2004, 06:30 AM Thank you very much Tom, it works poperly. Dennis

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