If I have M groups labelled by i = 1,2,...M, can someone show me how I would write this equation in Python. I will put in the variables values myself later. I just need to understand how to properly write this equation in python. Thanks!

I (t) = ii Nj + C ij Nj 1,3 = 1,... j=1 I (t) = ii Nj + C ij Nj 1,3 = 1,... j=1