How do I code a summation?

Machine Learning and Modeling
1

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Each Yij is a different column name with digits in each column. There are a total of four columns.

2

Making up some data for the numerator and denominator

num <- matrix(1,nrow = 10,ncol = 8)
denom <- matrix(1,nrow = 10,ncol = 8)

then

colSums(num/denom)