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The += and -= operators for vectors does not add or subtract a vector to or from itself. So if v is a vector, then v+=v and v-=v doesn't do anything.
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Thanks for the report. This bug is now fixed in our SVN repository (itpp-3-10 branch, rev. 1083). Will be included in the next stable release 3.10.12 (probably the last one of 3.10.x series).