how to draw the math graph?

how can i draw the graph in R?______________________________________________

I'm guessing you attached a graphic or other file in some format other than .png or .pdf and that it was stripped by the mail-server that only accepts text format or a very limited number of graphics formats. Most mail clients will not label anything with a .csv or .dat extension as MIME-text so they get stripped even if they are only just ASCII text. Even .Rata file s would get stripped

Before you reply  ... Please read ALL of the Posting Guide, then read ALL of the General Instructions page: http://www.r-project.org/mail.html#instructions

.....

and provide commented, minimal, self-contained, reproducible code.

Which means it is your responsibility (at least this is our understanding of the social contract) to provide a dataset in R code suitable for testing and creating illustration with.

David Winsemius
Alameda, CA, USA