It wasn't available for R 1.4.17. Or another package that allows reshaping data frames (wide to long) easily?
Use tidyr pivot_ functions
I have R studio 1.4.1717....
Just to clarify some points
Your RStudio version is not relevant for your problem because the IDE is independent of your R package library.
You get that error message because there is no R package called melt, you are most likely referring to the melt() function from the reshape2 package.
Also, as @nirgrahamuk mentioned, it would be better to use the pivot_longer() function from the tidyr package (which supersedes the old reshape2 package).
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