- #1

iwan89

- 27

- 0

## Homework Statement

Hello there. I ran a matlab program and i cant produce any graph. Please help me

## Homework Equations

This are the program

L = 1.;

T = 1.;

maxk = 2500;

dt = T/maxk;

n=50;

dx = L/n;

cond = 1/4;

b = 2.*cond*dt/(dx*dx);

for i= 1:n+1

x(i) = (i-1)*dx;

U(i,1) = sin(pi*x(i));

end

for k=1:maxk+1

u(1,k) = 0.;

u(n+1,k)=0.;

time(k) = (k-1)*dt;

end

for k=1:maxk

for i=2:n;

u(i,k+1)=u(i,k)+0.5*b*(u(i-1,k)+u(i+1,k)-2.*u(i,k));

end

end

figure (1)

plot (x,u(:,1),'-',x,u(:,100),'-',x,u(:,300),'-',x,u(:,600),'-')

title ('Temperature within the explicit method')

xlabel ('X')

ylabel ('Y')

figure (2)

mesh (x,time,u')

title ('Temperature within the explicit method')

xlabel ('X')

ylabel ('Temperature')

## The Attempt at a Solution

The program works but i cant produce any graph. I think there are little mistake somewhere.. :( pls help me