# Wolfram Language & System 10.0 (2014)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.
BUILT-IN WOLFRAM LANGUAGE SYMBOL

# FindMaxValue

FindMaxValue[f,x]
gives the value at a local maximum of f.

FindMaxValue[f,{x,x0}]
gives the value at a local maximum of f, found by a search starting from the point .

FindMaxValue[f,{{x,x0},{y,y0},}]
gives the value at a local maximum of a function of several variables.

FindMaxValue[{f,cons},{{x,x0},{y,y0},}]
gives the value at a local maximum subject to the constraints cons.

FindMaxValue[{f,cons},{x,y,}]
starts from a point within the region defined by the constraints.

## Details and OptionsDetails and Options

• FindMaxValue[] is effectively equivalent to First[FindMaximum[]].
• If the starting point for a variable is given as a list, the values of the variable are taken to be lists with the same dimensions.
• cons can contain equations, inequalities or logical combinations of these.
• The constraints cons can be any logical combination of:
•  lhs==rhs equations or inequalities {x,y,…}∈reg region specification
• FindMaxValue first localizes the values of all variables, then evaluates f with the variables being symbolic, and then repeatedly evaluates the result numerically.
• FindMaxValue has attribute HoldAll, and effectively uses Block to localize variables.
• FindMaxValue[f,{x,x0,x1}] searches for a local maximum in f using and as the first two values of x, avoiding the use of derivatives.
• FindMaxValue[f,{x,x0,xmin,xmax}] searches for a local maximum, stopping the search if x ever gets outside the range to .
• Except when f and cons are both linear, the results found by FindMaxValue may correspond only to local, but not global, maxima.
• By default, all variables are assumed to be real.
• For linear f and cons, xIntegers can be used to specify that a variable can take on only integer values.
• FindMaxValue takes the same options as FindMaximum.

## ExamplesExamplesopen allclose all

### Basic Examples  (4)Basic Examples  (4)

Find a maximum value of a univariate function:

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Find a maximum value of a multivariate function:

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Find a maximum value of a function subject to constraints:

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Find a maximum value of a function in a geometric region:

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