Question

I am trying to set up a 3D matrix in R. I guess this is an easy one. However, I didn’t find a solution so far.
Let’s say we want to create a 365x6x4 matrix.
Also crucial form me is how I can change one entry in the matrix.
Let’s say we want to assign the value 204 to the element [304,5,2].

Answer 1

Try this:

ar <- array(someData, c(365, 6, 4));  
ar[304,5,2] <- 204;

where someData might be

someData <- rep(0, 365*6*4);  

or even better maybe

someData <- rep(NaN, 365*6*4);