R语言嵌套函数出现Object not found错误，寻求解决方法

Hey there! Let's break down why you're running into that frustrating "Object not found" error when trying to apply the documents_ function to your core list. Here's what to check and fix:

1. First, confirm the documents_ function is available #

The most common reason for this error is that the function either isn't installed, or the package it belongs to hasn't been loaded.

• Run exists("documents_") in your console. If it returns FALSE, that means R can't find the function at all. You'll need to:
  1. Install the package that contains documents_ (e.g., install.packages("package_name") — replace package_name with the actual package relevant to your work, like a text processing package if documents_ is for text data).
  2. Load the package with library(package_name) before running your code.
• If you're unsure which package has documents_, try running ??documents_ to search for it in R's documentation.

2. Make sure you're applying the function correctly to your list #

Assuming documents_ is designed to work with data frames (like your table_1 and table_2), you need to iterate over the core list properly. The standard way to do this in R is with lapply():

# Load the required package first!
library(your_package_name)

# Apply documents_ to each element in the core list
output_list <- lapply(core, documents_)

If documents_ needs additional arguments (like specific parameters for processing), wrap it in an anonymous function:

output_list <- lapply(core, function(df) {
  documents_(df, parameter1 = "value1", parameter2 = 123)
})

3. Check if documents_ relies on missing objects #

Sometimes the error isn't about the function itself, but about an object that documents_ references internally. For example, if the function expects a global variable that you haven't defined, you'll get the same "Object not found" message.

• To check this, run documents_ without parentheses to view its source code, or look up its help page with ?documents_ to see all required inputs and dependencies.

Quick recap #

1. Verify the documents_ function is installed and loaded.
2. Use lapply() (or a similar iterator) to apply the function to every element in your core list.
3. Ensure all objects required by documents_ exist in your R environment.

内容的提问来源于stack exchange，提问作者Rodrigo Fileto