Posted by Ray Scholz on Wednesday, January 26, 2011 at 2:27pm.
Could someone check this matrix calculation
The first matrix dimension is 1 by 3
row 1 = 1
row 2 = 7
row 3 =3
Second matrix is 1 by 3
Row 1 column one =2
row 1 column two = 5
row one column three = 5
my calculation is that it would be the dimensions of 3 by 3
Final calcs would be row 1 column 1 = 2
row onecolumn two = 1
row one column three = 5
row two column 1 = 14
row two column two= 7
row two column three = 35
row three column one = 6
row three column two = 3
row three column three = 15
Is that correct?

Algebra IIPlease check calcs  Reiny, Wednesday, January 26, 2011 at 2:42pm
when you describe the first matrix as
row 1 = 1
row 2 = 7
row 3 =3
you are describing a column matrix with dimension 3 by 1 , not 1 by 3
so I see you multiplying
1
7
3
by
2 5 5
I got
2 5 5
14 35 35
6 15 15
I am used to this notation :
m by n matix has m rows and n columns
Are you not using that same notation?
anyway, you could not multiply a 1by3 by a 1by3, no matter what notation you are used to
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