I am trying to solve a matrix in the calculator: a 3x2 matrix A * 3x2 matrix B A= -56 -56 -49 -21 -63 -35 + B= 20 -36 -20 4 0 -36 I worked it out on paper and got the right answer but I get dimension error in the calculator when I put MatA+MatB and I made sure it was a 3x2 matrix for both. I did hit Shift > Alpha > Mode/Setup > 6: matrix > 1:matA > 2: 3x2 > entered in Martix A numbers and repeated the process 2nd time for MatB.....
There should not be any problem. There is however something you did not talk about. After you finish entering the coefficient of the second matrix (mat B) you should press the AC key. This way you exit the matrix editing utility.
Once the matrices are entered and saved,
Press [SHIFT][4] (Matrix)
Press 3: MatA
The label MatA appears on the screen.
Pres [+]
Press [SHIFT][4] (Matrix)
Press 4: MatB
At this point your screen shows MatA+MatB
Press [=] to get the result
[ [-36 , -92], [-69,-17],[-63, -71]]
Testimonial: "I still get an error (trying your method)"
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