Please help in removing the error in matlab code. I tried with changing the variable but that didn't help.
% Defining constants;
L=10; % length of domain in x-direction
tmax=10; % end time
nx=50; % number of nodes in x-direction
nt=50; % number of time steps
dx=L/(nx-1); % Length of space interval
dt=tmax/(nt-1); % Length of time interval
alpha=input('Enter the value of alpha: ');r=alpha*dt/dx^2;r2=1-2*r;% INITIAL CONDITION
t=0;u=0;% LOOP OVER TIME STEPS
for m=1:nt uold=u; t=t+dt; % LOOP OVER SPACE STEPS
for i=2:nx-1 u(i)=r*uold(i-1)+r2*uold(i)+r*uold(i+1); endend
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