If the input is the empty string, a temporary filename in a temporary directory will be created, but the global variable still stores the empty string.
Only if the user specifies a (non-empty) filename, the files created by
Normaliz are not removed.
i1 : getNmzFilename()
o1 =
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i2 : setNmzFilename("VeryInteresting");
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i3 : getNmzFilename()
o3 = VeryInteresting
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i4 : setNmzFile()
o4 = VeryInteresting
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i5 : setNmzFilename("");
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i6 : getNmzFilename()
o6 =
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i7 : setNmzFile()
o7 = /tmp/M2-52862-2
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