sumsqint

Finds all distinct ways of writing a number as the sum of squares, i.e. solve x^2+y^2=n for 0<=x<=y.

現在この提出コンテンツをフォロー中です。

Example:

sumsqint(1) % returns [0,1]
sumsqint(65) % returns [1,8;4,7]

sumsqint can work with large numbers if they are factored, e.g. solve x^2+y^2=(25e6)^2:
sumsqint(repmat(factor(25e6),1,2)) % returns 9x2 array

sumsqint works with variable precision integers if you have John D'Errico's Variable Precision Integer toolbox (20 July 2009 update) - see links below.

sumsqint(vpi(5)^100) % returns 51x2 vpi array
sumsqint(vpi(65)^100) % returns 5101x2 vpi array

The algorithm uses Gaussian integer factorization. See the help for more details.

引用

Ben Petschel (2026). sumsqint (https://jp.mathworks.com/matlabcentral/fileexchange/24798-sumsqint), MATLAB Central File Exchange. に取得済み.

謝辞

ヒントを得たファイル: Variable Precision Integer Arithmetic

一般的な情報

MATLAB リリースの互換性

  • すべてのリリースと互換性あり

プラットフォームの互換性

  • Windows
  • macOS
  • Linux
バージョン 公開済み リリース ノート Action
1.1.0.0

added support for factored inputs; fixed a bug in the handling of vpi numbers with prime factors larger than 100; added option to remember newly found gaussian prime factors.

1.0.0.0