I wish to learn how to calculate the sum of matrix elements, according to the images I display below these questions I currently working on either use the sum symbol Σ or notation of the individual matrix elements.
Q1.
Here I am confused about which elements are being summed.
Q2.
Here I don't understand why the second element index position is a variable.
I know that the sigma above denotes 1 + 2 + 3 = 6 without considering a2,j.
Is someone able to guide me through understanding this concept better and how to arrive at the correct result? I currently don't find any detailed explanations in the lecture or textbook I am currently studying from.
Q1.
Here I am confused about which elements are being summed.
Q2.
Here I don't understand why the second element index position is a variable.
I know that the sigma above denotes 1 + 2 + 3 = 6 without considering a2,j.
Is someone able to guide me through understanding this concept better and how to arrive at the correct result? I currently don't find any detailed explanations in the lecture or textbook I am currently studying from.