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CHAPTER 03.10: BINARY OPERATIONS:
Linear combination of matrices Example So
in this segment we are going to talk about an example of finding a linear
combination of matrices. So let’s suppose the problem states as follows: if
A1 matrix is given to you as 5, 6, 2, 3, 2, 1; another matrix B is given to
you - or not maybe B let’s call it A2 - is given to you as 2.1, 3, 2, 5, 1, 6;
another matrix A3 is given to you and that’s 0, 2.2, 2, 3, 3.5, and 6. So
let’s suppose somebody gives you these three matrices says: hey I have to
find this particular linear combination of these matrices, find A1+2A2-0.5A3.
So it’s pretty straight forward; all you have to do is to take this A1 matrix
multiply it by one each element, take this A2 matrix multiply it by 2 each
and every element, and take and take this A3 matrix and multiply each element
by -0.5, and then simply add element to element. So
let’s go and do that. So if I want to take the first matrix I’m going to
multiply by 1 because that’s what’s in front of it and there is nothing there
it will stay 5, 6 , 2, 3, 2, 1. Then I’m going to take the next matrix, I’m
going to multiply each element by 2, so I’m putting the 2 here for the time
being 5, 1, and 6 and then I’m going to take the last matrix which is given
and I’m going to multiply by -0.5; and I’m putting the A3 matrix here 0, 2.2,
2, 3, 3.5, and 6. So let’s go and see what we get here we get 5, 6, 2, 3, 2,
1; then we go to multiply each element of this matrix. Here there are 6
elements; here we will multiply by 2, so I get 4.2, 6, 4, 10, 2, 12, and then
I take -0.5 and I add it to each of the elements and I get -0 doesn’t matter
-1.1, -1, -1.5, -1.75, and -3. That’s
what I will get there and all you have to do is now is to do element by
element addition. So for example, if I want to now find what is the resulting
first row first column I will take the first row first column and get 5 then
add it to 4.2 and then add it to -0 I’ll get 9.2. So that’s what you would do
for each element. So the resulting matrix which you will get by adding all
those three matrices is as follows you’ll get 9.2, which we just calculated,
10.9, 5, 11.5, 2.25, and 10. So for example if you’re looking at this 10, how
did I get this 10 its simply adding 1 to 12 is 13
13-3 is 10. And that’s where we get 10. And that is the end of this segment |