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COPY[x,y]

copies the contents of the vector x to the vector y.

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

COPY

COPY[x,y]

copies the contents of the vector x to the vector y.

更多信息和选项

  • To use COPY, you first need to load the BLAS Package using Needs["LinearAlgebra`BLAS`"].
  • The following arguments must be given:
  • xinput expressionvector
    yinput/output symbolvector; the symbol value is modified in place
  • COPY[x,y] is equivalent to y=x.

范例

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基本范例  (1)

Load the BLAS package:

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

Assign a vector to y:

Wolfram Language code: COPY[{1, 2, 3}, y]; y

Scope  (4)

A real vector :

Wolfram Language code: COPY[{1.2, -2.3, 4.5}, y]; y

A complex vector:

Wolfram Language code: COPY[{1.2 + 2.3 I, 3.1 I}, z]; z

An arbitrary-precision vector:

Wolfram Language code: COPY[{1\`20,2,3},y]; y

A symbolic vector:

Wolfram Language code: COPY[{a, b, c}, s]; s

Properties & Relations  (1)

COPY[x,w] is equivalent to w=x:

Wolfram Language code: x = RandomReal[1, {5}]; COPY[x, w]; w == x

Possible Issues  (2)

If the second argument is not a symbol, an error message is issued:

Wolfram Language code: COPY[x, {2, 3, 4}]

If the output symbol has been initialized to a vector, the input and output must have the same length:

Wolfram Language code: COPY[{1, 2}, y]; y

To avoid this error, clear the existing output symbol.

Wolfram Language code: Clear[y] COPY[{1, 2, 3}, y]
Wolfram Research (2017)，COPY，Wolfram 语言函数，https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/COPY.html.

文本

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

CMS

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

APA

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

BibTeX

@misc{reference.wolfram_2026_copy, author="Wolfram Research", title="{COPY}", year="2017", howpublished="\url{https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/COPY.html}", note=[Accessed: 17-August-2026]}

BibLaTeX

@online{reference.wolfram_2026_copy, organization={Wolfram Research}, title={COPY}, year={2017}, url={https://reference.wolfram.com/language/LowLevelLinearAlgebra/ref/COPY.html}, note=[Accessed: 17-August-2026]}