Wolfram Function Repository

Instant-use add-on functions for the Wolfram Language

Function Repository Resource:

 LocalMaxima

Source Notebook

Compute the local maxima of an expression with respect to the given variables

Contributed by: Wolfram|Alpha Math Team

ResourceFunction["LocalMaxima"][expr,x]

computes the local maxima of expr with respect to x.

ResourceFunction["LocalMaxima"][expr,{x,y,…}]

computes the local maxima of expr with respect to multiple variables.

ResourceFunction["LocalMaxima"][{expr,const},{x,y,…}]

computes the local maxima of expr subject to the constraint const.

Details and Options

ResourceFunction["LocalMaxima"] returns a list with each maximum in the form {fmax,{x→xmax,y→ymax,…}}.
The cons can contain equations, inequalities or logical combinations of these.
ResourceFunction["LocalMaxima"] only returns results when there is a bounded maximum.

Examples

Basic Examples (2) 

Compute the local maxima of a polynomial:

In[1]:=
ResourceFunction["LocalMaxima"][x (x - 1) (x + 1), x]
Out[1]=

Plot them:

In[2]:=
Plot[x (x - 1) (x + 1), {x, -2, 2}, Epilog -> { Directive[Red, PointSize[Large]], Point[{-(1/Sqrt[3]), 2/(3 Sqrt[3])}]}]
Out[2]=

Scope (2) 

Use a constraint in order to reduce the domain upon which maxima can be found:

In[3]:=
ResourceFunction["LocalMaxima"][{Sin[x], 0 < x < 4 Pi}, x]
Out[3]=

Compute the maxima of a function of two variables:

In[4]:=
ResourceFunction["LocalMaxima"][( x^2 + y^2 - 4)^2, {x, y}]
Out[4]=

Possible Issues (1) 

LocalMaxima may return duplicate results for periodic functions:

In[5]:=
ResourceFunction["LocalMaxima"][-Sin[x], x]
Out[5]=

Publisher

Wolfram|Alpha Math Team

Version History

  • 2.0.0 – 23 March 2023
  • 1.0.0 – 18 September 2020

Related Resources

Author Notes

To view the full source code for GlobalMaxima, run the following code:

In[1]:=
FileNameJoin[ ReplacePart[ FileNameSplit[FindFile["ResourceFunctionHelpers`"]], -1 -> "FindExtrema.wl"]] // SystemOpen

License Information