In an R markdown file, I can't find the horizontal triangle at the upper right corner of the code chunk that enables me to run such code chunk?

In an R markdown file, I can't find the horizontal triangle at the upper right corner of the code chunk that enables me to run such code chunk?

It is difficult to help you with not so much information. Some hints:

  • Which version of RStudio are you using ?
  • Is your file a .Rmd file ?
  • Did you define a output format ?
  • Is your R chunk formats correctly ?