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HeavisideLambda [x]

represents the triangle distribution which is nonzero for .

HeavisideLambda [x1,x2,]

represents the multidimensional triangle distribution which is nonzero for .

Details
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Numerical Evaluation  
Specific Values  
Visualization  
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Function Properties  
Differentiation  
Integration  
Integral Transforms  
Applications  
Properties & Relations  
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HeavisideLambda [x]

represents the triangle distribution which is nonzero for .

HeavisideLambda [x1,x2,]

represents the multidimensional triangle distribution which is nonzero for .

Details

Examples

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Basic Examples  (4)

Evaluate numerically:

Plot in one dimension:

Plot in two dimensions:

Higher derivatives involve DiracDelta distributions:

Scope  (38)

Numerical Evaluation  (7)

Evaluate numerically:

Evaluate to high precision:

The precision of the output tracks the precision of the input:

Evaluate efficiently at high precision:

HeavisideLambda threads over lists:

Compute average-case statistical intervals using Around :

Compute the elementwise values of an array:

Or compute the matrix HeavisideLambda function using MatrixFunction :

Specific Values  (4)

Values of HeavisideLambda at fixed points:

Value at zero:

Evaluate symbolically:

Find a value of x for which the HeavisideLambda [x]=0.6:

Visualization  (4)

Plot the HeavisideLambda function:

Visualize scaled HeavisideLambda functions:

Visualize the composition of HeavisideLambda with a periodic function:

Plot HeavisideLambda in three dimensions:

Function Properties  (11)

Function domain of HeavisideLambda :

It is restricted to real inputs:

Function range of HeavisideLambda :

HeavisideLambda is an even function:

The area of HeavisideLambda is 1:

HeavisideLambda has singularities:

However, it is continuous everywhere:

Verify the claim at one of its singular points:

HeavisideLambda is neither nonincreasing nor nondecreasing:

HeavisideLambda is not injective:

HeavisideLambda is not surjective:

HeavisideLambda is non-negative:

HeavisideLambda is neither convex nor concave:

TraditionalForm typesetting:

Differentiation  (4)

Differentiate the univariate HeavisideLambda :

Higher derivatives with respect to x:

Differentiate the multivariate HeavisideLambda :

Differentiate a composition involving HeavisideLambda :

Integration  (4)

Integrate over finite domains:

Integrate over infinite domains:

Numerical integration:

Integrate expressions containing symbolic derivatives of HeavisideLambda :

Integral Transforms  (4)

FourierTransform of HeavisideLambda is a squared Sinc function:

FourierSeries :

Find the LaplaceTransform of HeavisideLambda :

The convolution of HeavisideLambda with HeavisidePi :

Applications  (2)

Integrate a function involving HeavisideLambda symbolically and numerically:

Visualize discontinuities in the wavelet domain:

Detail coefficients in the region of discontinuities have larger values:

Properties & Relations  (2)

The derivative of HeavisideLambda is a distribution:

At higher orders, the DiracDelta distribution appears:

The derivative of UnitTriangle is a piecewise function:

HeavisideLambda can be expressed in terms of HeavisideTheta :

Wolfram Research (2008), HeavisideLambda, Wolfram Language function, https://reference.wolfram.com/language/ref/HeavisideLambda.html.

Text

Wolfram Research (2008), HeavisideLambda, Wolfram Language function, https://reference.wolfram.com/language/ref/HeavisideLambda.html.

CMS

Wolfram Language. 2008. "HeavisideLambda." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/HeavisideLambda.html.

APA

Wolfram Language. (2008). HeavisideLambda. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/HeavisideLambda.html

BibTeX

@misc{reference.wolfram_2025_heavisidelambda, author="Wolfram Research", title="{HeavisideLambda}", year="2008", howpublished="\url{https://reference.wolfram.com/language/ref/HeavisideLambda.html}", note=[Accessed: 17-November-2025]}

BibLaTeX

@online{reference.wolfram_2025_heavisidelambda, organization={Wolfram Research}, title={HeavisideLambda}, year={2008}, url={https://reference.wolfram.com/language/ref/HeavisideLambda.html}, note=[Accessed: 17-November-2025]}

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