00:02
In this video, we're going to see if the products a times b or b times a are defined.
00:09
So first we need to see what dimensions these matrices are.
00:14
So to do that, we need to look at the number of rows and the number of columns.
00:18
So let's first look at a.
00:20
Okay, now we have one row, two rows, and then one column, two column, three columns.
00:31
So this is a 2 by 3 matrix.
00:36
Number rows, which are how many horizontals, go first, and then it's the verticals, the columns.
00:43
Okay, so 2 by 3, 2 rows by 3 columns.
00:47
Now let's see b.
00:48
Okay, b has 1, 2, 3 rows by 1, 2, 3 by 3 by 4 matrix.
01:01
Okay.
01:03
Now let's look at the product here.
01:05
Okay.
01:06
So let's say we have a times b.
01:11
Okay...