R allow error in lapply

Question

related to this question. I wanted to build a simple lapply function that will output NULL if an error occur.

my first thought was to do something like

lapply_with_error <- function(X,FUN,...){    
    lapply(X,tryCatch({FUN},error=function(e) NULL))
}

tmpfun  <- function(x){
    if (x==9){
        stop("There is something strange in the neiborhood")
    } else {  
        paste0("This is number", x)
    }
    }


tmp <- lapply_with_error(1:10,tmpfun )

But tryCatch does not capture the error it seems. Any ideas?

Answer 1

您需要提供lapply一个功能：

lapply_with_error <- function(X,FUN,...){    
  lapply(X, function(x, ...) tryCatch(FUN(x, ...),
                                      error=function(e) NULL))
}