NULL if have just one line in R

Question

I am trying to transform a dataframe Neigh = NULL if it has just one line:

I have tried:

Neigh <- Neigh[-(which(sapply(Neigh,nrow == 1)))]

I have one loop to plot graphs, but I don´t want to plot those with just one line. That's why I am trying to make the dataframes with one line = NULL.

Answer 1

As Roland just said, you can use an if condition. Use it with the nrow function (which returns the number of rows of your data.frame object) and you are done.

A simple example:

df <- data.frame(1,letters[1])
if(nrow(df)==1) {
  df <- NULL
}