tridiagonal matrix

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George
George 2011-5-25
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 ?

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Sean de Wolski
Sean de Wolski 2011-5-25
TD = full(gallery('tridiag',100,0.99 , -2 , 2.01))
EDIT Per Comment:
y = TD\B;
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Sean de Wolski
Sean de Wolski 2011-5-25
format long
Sean de Wolski
Sean de Wolski 2011-5-25
It is seeing all digits (64bit floating point), you're not viewing them all...

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