使用迭代器在for循环中分配给对象，作为对象名称的一部分

Question

I have a dataframe COG representing an experiment with a couple of different conditions. For a couple of calculations, I'd like to subset this dataframe into as many subsets as there are conditionsm, and I'd like the subset name to be something like COG.i with i being the condition.

for (i in unique(COG$cond)) {
 ??? <- subset(COG, COG$cond == i)
}

What would I need to put in place of the ??? ? It's not COG.i and definetely not paste0("COG.", i)

(I realize that one could also take care to "tidy" the data or use Dummy Codes for the different conditions, but apart from the statistics I'd like to get a better grasp of R in the first place.)

Thank you for your help!

Answer 1

Lists exist for this very purpose. Instead of having multiple variables, put the results in a list.

As suggested in the comments, you should use split to split your dataset into different subsets.

COG.split <- split(COG, COG$cond)

You can then access the different subsets using the [[ ]] operator, or use the *apply family of functions to perform operations on the various subsets.