Index in position 1 exceeds boundaries

I have just written a code for a heat transfer problem and when I run it I get an error stating 'Index in position 1 exceeds boundaries'. Apologies for the long code but if someone could point me in the right direction that would be really helpful. Thanks

[Star Strider]

The ‘T_c’ variable does not appear to exist.

Answer 1

[Mehmed Saad]

I am amusing that T_c is an 11x11 matrix.

see this line of code

suppose i=11 and j=2

T(i,j) = (T_c(i-1,j) + T_c(i+1,j))/4 + T_c(i,j-1)/2;

You are trying to access i-1 index, i+1 index and i index of array T_c. as your array T_c has dimension 11x11. when you try to access row index i-1 which is 11-1 = 10, T_c gives you value but when you try to access row index i+1, which is 11+1 = 12, T_c gives error because no value exist at 12th row (matrix is 11x11)

[Mehmed Saad]

either remove i+1 condition from Nth index and j+1 condition from Mth index (if that exist)

or add 12th row and column of zero (not recommended)