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This is a list of Mathematica tips and tricks.
Often you want something like this:
Position[mylist,#!=0&]
which is not syntactically correct in Mathematica (this syntax works in Select[] for instance, but not in Cases[], to me it's a bit inconsistent).
The following almost works:
Position[mylist,Expect[0]]
but it finds the head of your list and apparently other things as well, so you get results like {0}.
It's better to process mylist directly:
Position[#!=0&/@mylist,True]
Use before any (long) loop over $i$:
ProgressIndicator[Dynamic[i], {imin, imax}]
I don't know why it's called "ProgressIndicator" and not "ProgressBar".
You can also use the more informative Monitor[].
To export from $\mathrm{\LaTeX}$ [1] (typesetting through the notebook can be unreliable as it can revert a full expression to pseudocode):
ToExpression["string", TeXForm, HoldForm]
e.g.,
ToExpression[" a^\\dagger aa^\\dagger a a^{\\dagger k}a^l", TeXForm, \ HoldForm]
returns
Note that the \ should be escaped (so doubled). That will work without doing it but generates a warning.