how do I create the below Matrix?
显示 更早的评论
please see the attached image i need to create a tridiagonal nxn matrix using the diag function. i know how to make it this way but thats not what is required.
>> A=[2 -1 0 0 0;-1 2 -1 0 0;0 -1 2 -1 0;0 0 -1 2 -1; 0 0 0 -1 2]
A =
2 -1 0 0 0
-1 2 -1 0 0
0 -1 2 -1 0
0 0 -1 2 -1
0 0 0 -1 2
1 个评论
James Tursa
2015-3-24
"... not what is required."
Is this homework? Have you reviewed the doc on diag to see how to get values into the off-diagonals?
采纳的回答
Konstantinos Sofos
2015-3-24
Hi,
As James wrote you:Have you reviewed the doc on diag to see how to get values into the off-diagonals?
Mathworks offers an excellent documentation for such topics with plenty of examples.
You could use this
function Out = mydiag(n)
%n size of matrix Out
Out= diag(-1*ones(1,n-1),-1) + diag(2*ones(1,n)) + diag(-1*ones(1,n-1),1);
end
>> mydiag(5)
ans =
2 -1 0 0 0
-1 2 -1 0 0
0 -1 2 -1 0
0 0 -1 2 -1
0 0 0 -1 2
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Testing Frameworks 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
