please help me with this

i found this code on internet and its error is 'Not enough input arguments'.

how can i solve this?

Not enough input arguments.

Error in tridiag (line 3)

n = length(d); % n is the number of rows

function x = TDMAsolver(a,b,c,d)

%a, b, c are the column vectors for the compressed tridiagonal matrix, d is the right vector

n = length(d); % n is the number of rows

% Modify the first-row coefficients

c(1) = c(1) / b(1); % Division by zero risk.

d(1) = d(1) / b(1);

for i = 2:n-1

temp = b(i) - a(i) * c(i-1);

c(i) = c(i) / temp;

d(i) = (d(i) - a(i) * d(i-1))/temp;

end

d(n) = (d(n) - a(n) * d(n-1))/( b(n) - a(n) * c(n-1));

% Now back substitute.

x(n) = d(n);

for i = n-1:-1:1

x(i) = d(i) - c(i) * x(i + 1);

end

(matlab 2020a)

[Sibi]

what input you gave?

Answer 1

[Cris LaPierre]

You have not called TDMAsolver with all the inputs. Notice that it requires four inputs (a,b,c and d).

[arsalan mehrabi]

it dosent matter how many i enter stil it gives me the same error?

can you write the correct code please.

[Cris LaPierre]

The code is fine. You just need to call it correctly.

See this answer.

[arsalan mehrabi]

thanks man