Attempted to access T(1,0); index must be a positive integer or logical.

I have to create a toeplitz matrix without using the command. my teacher said to start off with something like this. Its for this problem Write a MATLAB routine (that is, a MATLAB function) that produces the finite difference solution ^u. Use a uniform discretization with x = 1=(n+1). (The input to the function should be n, and the output should be the approximate solution ^u.) Plot the approximate solution against the exact solution for n = 3, 7 and 15.

T(1,1)=1

T(1,2)=-1

for i=1:n-2

    T(i,i-1)=1;
    T(i,1)=-1;
    T(i,i+1)=0;
end

It keeps giving me the error -Attempted to access T(1,0); index must be a positive integer or logical.- Anyone have a better idea of how to create this thing?

Answer 1

[Image Analyst]

When i = 1 (your first iteration), then i-1 equals zero, so you'd have T(1,0). Zero is not allowed as a column number. Start your loop with i=2.

[Kyle]

Thanks a lot. It helped me figure out some other problems as well!