MATLAB: Tridiagonal matrix

equationgallerytridiagtridiagonal matrix

Hi there. i have this equation | 0.99y(i+1) -2y(i) +2.01y(i-1)=0,0002 | i want i from 1 to 99. So i will have 99 equations with 99 unknowns. The first step is to make a tridiagonal matrix and store the numbers : 0.99 , -2 , 2.01 . How can i do that ?

Best Answer

TD = full(gallery('tridiag',100,0.99 , -2 , 2.01))

EDIT Per Comment:

y = TD\B;

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   D=nan(size(A));
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     D(2:2:end)=A(2:2:end)./C(2:2:end);

MATLAB: How can i create a 400 by 400 matrix with a pattern

full(gallery('tridiag', 400))

If the subdiagonal, diagonal and superdiagonal were anything other than -1, 2, 1, for example: 1, 2, 3 respectively:

fulll(gallery('tridiag', 400, 1, 2, 3))

Another way:

toeplitz([2, -1, repelem(0, 398)])

Best Answer

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MATLAB: Need help alternating equations

MATLAB: How can i create a 400 by 400 matrix with a pattern

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