SWAP

LinearAlgebra`BLAS`

SWAP

SWAP[x,y]

swaps contents of the vectors x and y.

詳細とオプション

To use SWAP, you first need to load the BLAS Package using Needs["LinearAlgebra`BLAS`"].
The following arguments must be given:
x input/output symbol vector; the symbol value is modified in place

y input/output symbol vector; the symbol value is modified in place
SWAP[x,y] is equivalent to {x,y}={y,x}.
The vector arguments must be of the same length.

例題

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例 (1)

Load the BLAS package:

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

Swap two vectors :

Wolfram Language code:

x = {1, 2, 3}; 
y = {-1, 0, 1};
SWAP[x, y];
{x, y}

Scope (4)

Real vectors:

Wolfram Language code:

x = {1.2, -3.1, 0.4};
y = {-2.9, 1.6, 2.2};
SWAP[x, y];
{x, y}

Complex vectors:

Wolfram Language code:

x = {2.I, -3. + 1.2I, 3.};
y = {0.4 + 7.3I, 2.2, 2.1I};
SWAP[x, y];
{x, y}

Arbitrary-precision vectors:

Wolfram Language code:

x = {1`20, 2, 3}; 
y = {-1`20, 0, 1};
SWAP[x, y];
{x, y}

Symbolic vectors:

Wolfram Language code:

x = {v1, v2, v3};
y = {w1, w2, w3};
SWAP[x, y];
{x, y}

Generalizations & Extensions (2)

Swap the first two rows of a matrix in place:

Wolfram Language code:

m = Array[a, {3, 3}];
SWAP[m[[1]], m[[2]]];
m//MatrixForm

Swap the second and third columns of a matrix in place:

Wolfram Language code:

m = Array[a, {3, 3}];
SWAP[m[[All, 2]], m[[All, 3]]];
m//MatrixForm

Properties & Relations (1)

SWAP[x,y] is equivalent to {x,y}={y,x}:

Wolfram Language code:

x = x1 = RandomReal[1, {5}];
y = y1 = RandomReal[1, {5}];
SWAP[x, y];
{x, y} == {y1, x1}

Possible Issues (3)

The arguments must be symbols:

Wolfram Language code: SWAP[{1, 2}, {3, 4}]

The arguments must be initialized to vectors:

Wolfram Language code:

Clear[x, y];
SWAP[x, y]

The arguments must be of equal length:

Wolfram Language code:

x = {1, 2};
y = {3, 4, 5};
SWAP[x, y]

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SWAP

詳細とオプション

例題

例 (1)

Scope (4)

Generalizations & Extensions (2)

Properties & Relations (1)

Possible Issues (3)

テキスト

CMS

APA

BibTeX

BibLaTeX

	x	input/output symbol	vector; the symbol value is modified in place
	y	input/output symbol	vector; the symbol value is modified in place

SWAP

詳細とオプション

例題

例 (1)

Scope (4)

Generalizations & Extensions (2)

Properties & Relations (1)

Possible Issues (3)

関連するガイド

テキスト

CMS

APA

BibTeX

BibLaTeX