Finite difference scheme and iteration what is wrong with my code? Please help me

function Perturbation(x,N,epsilon)
clc
close all
x=10;
N=10;
M=10;
h=1/M;
alpha=1;
beta=-1;
epsilon=0.01;

dtau=1/N;                                             % step size
tau = 0:dtau:4;                                         % Calculates upto y(3)
w = sym(zeros(1,length(tau))); 
   t=  sym(zeros(1,length(tau)));                                    % initial condition
F_0 = @(r) r;                    % change the function as you desire
F_10 = @(r) 2*r; 
F_11 = @(r) 3*r;

for i=1:(length(h)-1)                              % calculation loop
    tk=i*tau;
    t=tk;
    w(0) = F_0(t(i));
    w(1) = F_10(t(i))+F_11(t(i));
    w(i+1) = w(i) + w(i-1)+x  % main equation
end

[Asvin Kumar]

It's unclear what you're trying to do or where you're stuck or whether you're encountering an error.

Please provide more details on the expected output/behaviour so the community may help you.

Just at first glance, I see that h is a scalar but you use it to determine values of i. This would never iterate. Maybe you intended to use length(t) instead? You're redefining t (or tk) inside the for loop but you don't use it. w(0) and w(1) needn't be computed repeatedly. Your function arguments are overwritten.

Looks like you're new to MATLAB. Please considering taking the MATLAB onramp training which will help you get started with the language.

MATLAB Onramp: https://www.mathworks.com/learn/tutorials/matlab-onramp.html

How to ask questions: https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[OZGUR YILDIRIM]

Thank you very much. I am new to Matlab. I want to perform an iteration symbolically and substitute numeric values for syms at each step of the iteration.

Is there any code satisfying this conditions?

Thank you in advance

[Asvin Kumar]

https://www.mathworks.com/help/symbolic/subs.html Should do just that.

[OZGUR YILDIRIM]

Thank you very much.