In short, if you are having trouble with Mathematica, reset it fully by restarting the kernel, don't just clear your own definitions. ClearAll won't help with shadowing but Remove will). ![]() This is all in addition to the difference between Remove and ClearAll which people mentioned in the comments and which is also significant (e.g. There are many more than these, very likely including many which concern the internal workings of Mathematica and we don't even know about (as they are not publicly documented). This list is not at all meant to be exhaustive, it is simply to illustrate how many things get modified during a session. With respect to symbols, Quit has the effect of Remove, which 'removes symbols completely, so that their names are no longer recognized by the Wolfram Language.' In contrast, ClearAll 'clears all values, definitions, attributes, messages, and defaults associated with symbols. These are just a few random but concrete examples that came to mind. Using various symbols triggers loading definition and triggers loading packages. Parallel kernels keep running, ParallelNeeds keeps remembering "needed" packages, DistributeDefinitions keeps remembering what was distributedĪ fresh kernel doesn't have all symbol definitions loaded. SocialMediaData) may be remembered until the end of the session Pseudo-random number generator states change (and this also involves caching behind the scenes, which in principle affects memory usage) One of them consistently fails when the other notebook is open, despite my (liberal) use of Clear to clear out the relevant variables. Both work fine when theyre the only notebook open. Symbolic results are cached ( ClearSystemCache) and will actually cause symbolic processing functions to return different results than they would in a fresh session. I have two different Mathematica notebooks with similar, but different functions. When you load a package, it does not only create its own context, it also causes $Context and $Packages to be modified ![]() So simply clearing (or removing) symbols won't reset the kernel. There is a lot of internal state that changes during the session in ways that are different from creating new symbols or attaching definitions. ![]() Quit does not "clear" anything, it instead restarts the kernel, i.e. There are significant practical differences.
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