tridiagonal matrix

2011 5 25
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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

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TD = full(gallery('tridiag',100,0.99 , -2 , 2.01))
EDIT Per Comment:
y = TD\B;

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George
George 2011-5-25
great. Let's say that we have that TD. We also have the unknowns y(i), for i from 1 to 99. We also have a B 99x1 matrix with the value 0.0002 in it. How i will solve the TDy(i)=B equation ?
George
George 2011-5-25
next step. I am getting 50.5051 for an answer for all vallues from 2 to 98. How can i make it to see more digits ?
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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