iPython notebooks don't have the functionality of R Notebooks. R Notebooks allow you to prepare something for presentation, not just for running/testing. I.e.:

iPython notebooks don't have the functionality of R Notebooks. R Notebooks allow you to prepare something for presentation, not just for running/testing. I.e.: You can run code and then choose to present the code and the output, just the code, just the output or none of them (for instance just putting a sentence in the presentation where you say you applied some mathematical function to the data, but show the mathematica function (latex) instead of the code. This is really important to publish and to present data and it's not possible to do in Jupyter/iPhython. Also, it allows you to export directly to HTML/PDF. Something Jupyter doesn't.