How to add product or function on Rstudio

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R_code <- code

Can somebody help me? I am struggling to add functions, products to work on my RStudio. I am new on the software

Could you give us some more detail of what you are trying to achieve? I'm not sure what you mean by "add functions, products". Are you trying to write a function or something more than that?

first I just want to make my excell file convert to
second is just to write a fonction

Here is an example of reading an Excel file using the readxl package. The file is named ExpData.xlsx, it is in the current working directory, and I want to read the sheet named Raw.

DF <- read_excel("ExpData.xlsx", sheet = "Raw")