Create a lens into the upper diagonal elements of a matrix
1  | upper_tri_l(diag = FALSE)
 | 
diag | 
 whether or not to include the diagonal (x <- matrix(1:9, ncol = 3)) view(x, upper_tri_l()) view(x, upper_tri_l(diag = TRUE)) set(x, upper_tri_l(), c(100, 200, 300))  | 
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