Prompt
Answer
Code Analysis
The provided R code intends to write a given DataFrame to a CSV file. The structure includes package installation, input validation, directory creation, and the actual file-writing process. However, there are a few issues that need addressing:
- Incorrect Variable Reference: The validation block references
PIDTCList
instead of thedf
parameter. - Improvement in Documentation: The code comments should clarify which library
require
pertains to.
Solution Development
Let's refine the function and ensure it adheres to best practices, fixing the variable reference and improving documentation.
Revised Function
# Import necessary libraries
if (!require("utils")) install.packages("utils", dependencies=TRUE)
library(utils)
# Write DataFrame to CSV File
# This function writes a given DataFrame to a specified CSV file within a designated directory.
#
# @param df DataFrame to be written to CSV. Must be a valid DataFrame object.
# @param file_name Desired name for the output CSV file (without path).
#
# @throws Error if `df` is not a DataFrame or if `file_name` is not a character string.
#
# @return NULL
write_df_to_csv <- function(df, file_name) {
# Input validation
if (!is.data.frame(df)) {
stop("Error: Input 'df' must be a DataFrame.")
}
if (!is.character(file_name) || length(file_name) != 1) {
stop("Error: 'file_name' must be a single character string.")
}
# Create directory if it does not exist
dir_path <- "Files/CSV"
if (!dir.exists(dir_path)) {
dir.create(dir_path, recursive = TRUE)
}
# Construct the full file path
file_path <- file.path(dir_path, file_name)
# Write the DataFrame to CSV
write.csv(df, file=file_path, row.names=FALSE)
# Inform the user of the completed action
message(sprintf("DataFrame has been successfully written to '%s'", file_path))
}
# Example Usage
# Assuming `example_df` is a DataFrame object available in the environment
# example_df <- data.frame(A=1:5, B=6:10) # Sample Data Frame, not needed if `example_df` is pre-existing
write_df_to_csv(example_df, "example_output.csv")
Explanation
Code Imports and Library Initialization:
- Ensures
utils
library is loaded.
- Ensures
Function
write_df_to_csv
:- Validates the
df
input to ensure it is a DataFrame. - Validates
file_name
to ensure it is a single character string. - Checks if the directory exists; if not, creates it.
- Constructs the full file path using
file.path
. - Writes the DataFrame to the specified CSV file and informs the user upon successful completion.
- Validates the
Usage Example:
- Demonstrates how to use the
write_df_to_csv
function with a sample DataFrameexample_df
.
- Demonstrates how to use the
This revised function addresses the initial problems and improves code clarity and correctness.
Description
This R function writes a DataFrame to a specified CSV file after validating inputs, ensuring best practices, and creating directories as needed. It enhances usability with clear documentation and error handling, making CSV export seamless.
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