Store graphics to a list without index

[Gabbi]

Hi,
I am using a loop for generate data to be used in some plots, but the function computes results from 5 repetitions.
When a tried to insert the graphs in a list, only one graph from the last repetition is saved, because the list index is different from the loop index.
Is there a way to use an empty list without especify the index? (like function append for example)

To simplify, here is a pseudocode:

graphs_list <- list()

for(i in 1:4){
data_i <- data[[i]]
for(j in 1:5) {
predict_ANN_ij <- compute(ANN, rep = j)
plot_base <- tibble(observed, predict_ANN_ij)
graph <- ggplot(plot_base)

graphs_list[[...]] <- graph
}
}

The code is runnig right.
All graphs are printted correctly, but I need to store them inside an object to further use.
Can someone help me please!!

[woodward]

What's the advantage of not using an index? Just use an index! Index can be anything at all. e.g.

graphs_list[[paste(i,j)]] <- graph

Also, there is indeed an append function that can be used with lists. Did you check the help?

[Gabbi]

Because I need a different index for the list, and I tried to use other things. Still don't work.
I've tried the append function, didn't work for figures. And graphs_list[[paste(i,j)]] <- graph didn't work too.

[woodward]

What error message do you get? This should work fine.

[Gabbi]

I did a regression with i and j to use inside the list index, and worked! =D
Maybe there is an easier way, but I had to go on.
Thanks for the help!