Rowwise matrix multiplication in R

Question

I have a matrix with the dimension of 100 million records and 100 columns.

Now I want to multiply that matrix by rowwise.

My sample code for matrix multiplic

Answer 1

The Rfast command "rowprods" accepts a matrix, not a data.frame. Secondly, any row or colprods command will have numerical overflow errors. So ti best to use Rfast::colprods(x, method = "expsumlog").