I am finding error while writting code of tridiagonal matrix as my matlab do not konw what is tridiagonal

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Aman Murkar 2021-10-2

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https://ww2.mathworks.cn/matlabcentral/answers/1465209-i-am-finding-error-while-writting-code-of-tridiagonal-matrix-as-my-matlab-do-not-konw-what-is-tridia

评论： KSSV 2021-10-2

function x = Tridiagonal(e,f,g,r)
% Tridiagonal: Tridiagonal equation solver banded system
% x = Tridiagonal(e,f,g,r): Tridiagonal system solver.
% input:
% e = subdiagonal vector
% f = diagonal vector
% g = superdiagonal vector
% r = right hand side vector
% output:
% x = solution vector
n=length(f);
% forward elimination
for k = 2:n
    factor = e(k)/f(k-1);
    f(k) = f(k) - factor*g(k-1);
    r(k) = r(k) - factor*r(k-1);
end
% back substitution
x(n) = r(n)/f(n);
for k = n-1:-1:1
    x(k) = (r(k)-g(k)*x(k+1))/f(k);
end

getting error as follows:

> Tridiagonal

Not enough input arguments.

Error in Tridiagonal (line 11)

n=length(f);

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回答（1 个）

KSSV 2021-10-2

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在 MATLAB Online 中打开

Do not run th function as code i.e. you are running the code with f5 or using the run button. You need to give inputs to the function and then call it.

% Example
e = value ;  % define your variable
f = value ;  % define your variable 
g = value ;  % define your variable 
r = value ;  % define your variable
% call your function
x = Tridiagonal(e,f,g,r) ; 

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Aman Murkar 2021-10-2

编辑：Aman Murkar 2021-10-2

for that I was running above code to define what is tridiagonal

KSSV 2021-10-2

The question you asked here conveys different. When running code, see to it that the function is saved in the same folder where you are running the code. Or add path of this function.

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