in or out of a for loop in R - calculating the diagonal product of a matrix -


i'm trying find maximum diagonal product of 2 digit numbers in 20x20 matrix.

this gives error message :

i <- 17:1 z <- (j in 1:(18-i))         {b <- max ((x[i,j]*x[i+1,j+1]*x[i+2,j+2]*x[i+3,j+3]))}} 

but doesn't:

z <- (i <- 17:1) {for (j in 1:(18-i))         {b <- max ((x[i,j]*x[i+1,j+1]*x[i+2,j+2]*x[i+3,j+3]))}} 

but second version gives me number small . why first 1 not work, think yield correct answer, don't understand error message.

this looks wrong.

you cannot assign result of for loop variable. , max() on scalar variable nonsense. lastly, matrix x isn't specified. i'd retry smaller, , maybe print interim results screen.

walk before run still advice. later can still vectorise sprint solution.


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