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NRM2[x]

gives the Euclidean norm of the vector x.

更多信息和选项
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范例  
基本范例  
Scope  
Properties & Relations  
相关指南
按以下格式引用：
LinearAlgebra`BLAS`
LinearAlgebra`BLAS`

NRM2

NRM2[x]

gives the Euclidean norm of the vector x.

更多信息和选项

  • To use NRM2, you first need to load the BLAS Package using Needs["LinearAlgebra`BLAS`"].
  • The following argument must be given:
  • xinput expressionvector
  • NRM2[x] is equivalent to Sqrt[x.Conjugate[x]].

范例

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基本范例  (1)

Load the BLAS package:

Wolfram Language code: Needs["LinearAlgebra`BLAS`"]

Compute the Euclidean norm of a vector:

Wolfram Language code: NRM2[{1, 2, 3}]

Scope  (4)

A real vector:

Wolfram Language code: NRM2[{2.1, 3.4, 5.7, 4.9}]

A complex vector:

Wolfram Language code: NRM2[{2.1 + 0.3I, 2.I, 3.9 - 0.7I}]

An arbitrary-precision vector:

Wolfram Language code: NRM2[{1`20, 2`20, 3`20}]

A symbolic vector:

Wolfram Language code: NRM2[{v1, v2, v3}]

Properties & Relations  (2)

For a vector x, NRM2[x] is equivalent to Norm[x]:

Wolfram Language code: x = RandomComplex[1. + I, {5}]; NRM2[x] == Norm[x]

For a vector x, NRM2[x] is equivalent to Sqrt[x.Conjugate[x]]:

Wolfram Language code: x = RandomComplex[1. + I, {5}]; NRM2[x] == Sqrt[x.Conjugate[x]]
Wolfram Research (2017)，NRM2，Wolfram 语言函数，https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/NRM2.html.

文本

Wolfram Research (2017)，NRM2，Wolfram 语言函数，https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/NRM2.html.

CMS

Wolfram 语言. 2017. "NRM2." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/NRM2.html.

APA

Wolfram 语言. (2017). NRM2. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/NRM2.html 年

BibTeX

@misc{reference.wolfram_2026_nrm2, author="Wolfram Research", title="{NRM2}", year="2017", howpublished="\url{https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/NRM2.html}", note=[Accessed: 17-August-2026]}

BibLaTeX

@online{reference.wolfram_2026_nrm2, organization={Wolfram Research}, title={NRM2}, year={2017}, url={https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/NRM2.html}, note=[Accessed: 17-August-2026]}