Create a n*n matrix

Create a n*n matrix A such that A_(n, n-1) = n and A_(n, n) = -(n-1)

[Dyuman Joshi]

What about the rest of the elements? What value should they have?

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the free MATLAB Onramp tutorial to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Nischal]

It is not a homework problem. I needed to create a n*n matrix to verify some of my results. Other elements have variables in diagonal and sub diagonal.

[Dyuman Joshi]

"Other elements have variables in diagonal and sub diagonal."

Which variables? Please give an example.

Let's say n = 5, what should be the output?

Answer 1

[Image Analyst]

This looks like a homework problem. If you have any questions ask your instructor or read the link below to get started:

How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central

Obviously we can't give you the full solution because you're not allowed to turn in our code as your own. Hint: use zeros followed by a single for loop.

To learn other fundamental concepts, invest 2 hours of your time here:

MATLAB Academy - Free 2 hour training

Answer 2

[Image Analyst]

OK, please tell me you did not ignore my last answer and that you actually did spend the two hours to do the basic training. If you did, you would easily have been able to write this loop:

% Require A_(n, n-1) = n and A_(n, n) = -(n-1)
n = 5;
A = zeros(n, n);
for k = 1 : n
    A(k, k) = -(k+1);
end
for k = 2 : n
    A(k, k-1) = k;
end
A % Display in command window.

A = 5×5

-2 0 0 0 0 2 -3 0 0 0 0 3 -4 0 0 0 0 4 -5 0 0 0 0 5 -6

Does that look like what you did? Actually I'm guessing you ignored my answer and didn't take the training or else you wouldn't have to ask again several days later. Anyway, you can use this code. I hope it helps.