Dear R users, > I want to thank you all for your contributions to the problem I posted. It > has been solved. Find below the code that solved the problem. > df1 <- read.table("SWS1998_2002", header = TRUE) df1$date <- as.Date(paste(df1$year, df1$day), format = "%Y %j", origin = "1998-01-01") df2 <- df1[c("date", "Dst")] head(df2) #To display all the rows print(df2 Thanks, Jibrin Alhassan
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