Having now upped my license to 2015a, there should be a way to simply transfer the old (non-TMW supplied) search path to a new release.
Since for me, this involves adding several dozen of my own toolboxes, as well as a variety of those I have downloaded from the FEX, this is the hardest part.
I'd like to see an export external search path option, then an import external search path in the new release. It should be doable, in fact, I can see the way to write it if nobody has a better idea.
I'd write a simple gui tool, that would allow me to select a subset of the directories in my current searchpath, then export a file that contains that list. Then an import tool would read that file, and allow me to choose to add those directories to the top or bottom of my searchpath.
The problem here is when I install the new release, it won't have the import tool on my new search path. Still better than nothing, but this would be best if it was already in MATLAB. I don't see it in pathtool though.
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