research group is a strong Mathematica user and suggested I double-check results originally analyzed using Python with his Mathematica notebook. I was introduced to Mathematica in graduate school in my advanced quantum mechanics course, during the first semester of my Ph.D. My undergraduate research demanded that I learn bash scripting and Tcl and that I continue using Python. This interest continued through college, where I was classically trained in both Python and Java but continued to use Wolfram|Alpha for math and chemistry. I discovered Wolfram in high school, where I was - and still am! - fascinated by Wolfram|Alpha’s natural language capability and knowledgebase. I very quickly felt comfortable using Mathematica in both of these capacities, but I had yet to truly use it as a programming platform with the Wolfram Language.

Since I started working at Wolfram, I have been almost exclusively using Mathematica, not only as computing software but also as a program in which to write documents. I feel this is a very basic question and am embarrassed to ask, but need a better way.The following was written by David Stevens and was originally published on the Wolfram Blog. My question is how to reevaluate the changed, saved notebook from scratch? I have tried putting a 'clear all' as the first line but this does not seem to throw away all data, etc from the previous evaluation. The only way this work is for me to exit Mathematica, restart it, reload the notebook and then evaluate the notebook in the new Mathematica session.

I want to rerun the notebook after saving a new version and have it be evaluated from scratch. However, I have noticed that the new notebook does not work well because it seems that the data associated with the previously run notebook is not cleared. I then want to evaluate the newly saved notebook but I want it to be evaluated from scratch and not use data which I had created in the previous version during the current session. I am creating notebooks which usually get edited.

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