Editing Quadratic programming (section)

== Mixed-integer quadratic programming ==
There are some situations where one or more elements of the vector {{math|'''x'''}} will need to take on [[integer]] values. This leads to the formulation of a mixed-integer quadratic programming (MIQP) problem.<ref>{{Cite journal|last=Lazimy|first=Rafael|date=1982-12-01|title=Mixed-integer quadratic programming|journal=Mathematical Programming| language=en| volume=22| issue=1| pages=332–349| doi=10.1007/BF01581047| s2cid=8456219|issn=1436-4646}}</ref> Applications of MIQP include [[water resources]]<ref>{{Cite journal|last1=Propato Marco|last2=Uber James G.|date=2004-07-01|title=Booster System Design Using Mixed-Integer Quadratic Programming|journal=Journal of Water Resources Planning and Management|volume=130|issue=4|pages=348–352|doi=10.1061/(ASCE)0733-9496(2004)130:4(348)}}</ref> and the [[Tracking error#Index fund creation|construction of index funds]].<ref>{{Cite book|last1=Cornuéjols|first1=Gérard|url=https://www.cambridge.org/core/books/optimization-methods-in-finance/8A4996C5DB2006224E4D983B5BC95E3B|title=Optimization Methods in Finance|last2=Peña|first2=Javier|last3=Tütüncü|first3=Reha|publisher=Cambridge University Press|year=2018|isbn=9781107297340|edition=2nd|location=Cambridge, UK|pages=167–168}}</ref>