File & Connection Errors

Connection failed

Matches: cannot open connection

WHAT THIS ERROR MEANS

R failed to establish a connection to a file, URL, or database. The resource may not exist or be unreachable.

1. Verify the path or URL exists.

2. Check your internet connection for URLs.

3. Make sure the file isn't locked by another process.

BAD — THIS CAUSES THE ERROR

read.csv("http://broken-url.com/data.csv")

GOOD — CORRECT APPROACH

# Verify URL is accessible first
url <- "https://valid-url.com/data.csv"
read.csv(url)

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