Functions of I, for i=1, n, n-1

I have the equation:

dT = (a/r) * ((T(i+1) - T(i-1))/2*dr) + r*((T(i+1) - T(i) + T(i-1)) / dr^2) + q/cp*rho;

I want to plug in values for i, such as i=1, i=2:n-2, and i=n-1. where n=51

I am not sure how to go about this.

Answer 1

[Walter Roberson]

dT = @(i) (a/r) * ((T(i+1)  - T(i-1))/2*dr) + r*((T(i+1) - T(i) + T(i-1)) / dr^2) + q/cp*rho;

dT(2:n-2)

Caution, dT(1) will fail.