HeavisideLambda [x]
represents the triangle distribution which is nonzero for .
HeavisideLambda [x1,x2,…]
represents the multidimensional triangle distribution which is nonzero for .
HeavisideLambda
HeavisideLambda [x]
represents the triangle distribution which is nonzero for .
HeavisideLambda [x1,x2,…]
represents the multidimensional triangle distribution which is nonzero for .
Details
- HeavisideLambda [x] is equivalent to Convolve [HeavisidePi [t],HeavisidePi [t],t,x].
- HeavisideLambda can be used in derivatives, integrals, integral transforms, and differential equations.
- HeavisideLambda has attribute Orderless .
Examples
open all close allBasic 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:
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 :
See Also
Related Guides
Related Links
History
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]}