Raster memory usage in R

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I am working with raster/brick data in R and running into memory issues. I am basically trying to use raster objects to perform some simple agent-based modeling, but the objects keep increasing in size for reasons I can't understand.

Below is some code that demonstrates what I am talking about.

#### Test memory ###library(pryr)library(raster)br = brick()for(i in 1:25){ r1
 
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