ArgMax

ArgMax[f,x]
gives a position at which f is maximized.

ArgMax[f,{x,y,}]
gives a position at which f is maximized.

ArgMax[{f,cons},{x,y,}]
gives a position at which f is maximized subject to the constraints cons.

ArgMax[,xreg]
constrains x to be in the region reg.

ArgMax[,,dom]
constrains variables to the domain dom, typically Reals or Integers.

Details and OptionsDetails and Options

  • ArgMax[,vars,] is effectively equivalent to vars/.Last[Maximize[,vars,].
  • cons can contain equations, inequalities, or logical combinations of these.
  • The constraints cons can be any logical combination of:
  • lhs==rhsequations
    lhs!=rhsinequations
    or inequalities
    {x,y,}regregion specification
    Exists[x,cond,expr]existential quantifiers
  • If f and cons are linear or polynomial, ArgMax will always find a global maximum.
  • ArgMax[{f,cons},xreg] is effectively equivalent to ArgMax[{f,consxreg},x].
  • For , the different coordinates can be referred to using Indexed[x,i].
  • ArgMax will return exact results if given exact input.
  • If ArgMax is given an expression containing approximate numbers, it automatically calls NArgMax.
  • If the maximum is achieved only infinitesimally outside the region defined by the constraints, or only asymptotically, ArgMax will return the closest specifiable point.
  • If no domain is specified, all variables are assumed to be real.
  • xIntegers can be used to specify that a particular variable can take on only integer values.
  • If the constraints cannot be satisfied, ArgMax returns .
  • N[ArgMax[]] calls NArgMax for optimization problems that cannot be solved symbolically.

ExamplesExamplesopen allclose all

Basic Examples  (5)Basic Examples  (5)

Find a maximizer point for a univariate function:

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Find a maximizer point for a multivariate function:

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Find a maximizer point for a function subject to constraints:

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Find a maximizer point as a function of parameters:

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Find a maximizer point for a function over a geometric region:

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Plot it:

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Introduced in 2008
(7.0)
| Updated in 2014
(10.0)