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How can i change the 1st row 1st column and last row last column values in a tridiagonal matrix

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Harin Nelumdeniya
Harin Nelumdeniya 2018-4-22
回答： Are Mjaavatten 2018-4-22
n=5;
A=zeros(n,n);
for i=1:n
if (i>1)
A(i-1,i)=-100;
end
A(i,i)=300;
if (i<n)
A(i+1,i)=-100;
end
end
I wrote the code above to create a tridiagonal matrix. I need to separate the 1st row 1st column variable and the last row last column variable, so that i can assign a different value for these two variable's but im not sure how to write a statement to do this task.

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采纳的回答

Are Mjaavatten
Are Mjaavatten 2018-4-22 
A(1,1) = 17;A(end,end) = 23;

You can create your original matrix without using a loop:

n = 5;
A = diag(ones(1,n))*300-diag(ones(1,n-1)*100,-1)-diag(ones(1,n-1)*100,1);

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