MATLAB内で使用されている組み込み関数(私自身知りたいのは"sort"です)の中身のコードがどのようになっているかを見るためにはどのようにすればよいでしょうか.ちなみに現在sort関数を開くとすべて説明文(コメントアウト)で,どのように構築されているかは記載されておりません.下記に示しておきます.
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%SORT Sort in ascending or descending order.
% B = SORT(A) sorts in ascending order.
% The sorted output B has the same type and size as A:
% - For vectors, SORT(A) sorts the elements of A in ascending order.
% - For matrices, SORT(A) sorts each column of A in ascending order.
% - For N-D arrays, SORT(A) sorts along the first non-singleton dimension.
%
% B = SORT(A,DIM) also specifies a dimension DIM to sort along.
%
% B = SORT(A,DIRECTION) and B = SORT(A,DIM,DIRECTION) also specify the
% sort direction. DIRECTION must be:
% 'ascend' - (default) Sorts in ascending order.
% 'descend' - Sorts in descending order.
%
% B = SORT(A,...,'MissingPlacement',M) also specifies where to place the
% missing elements (NaN/NaT/<undefined>/<missing>) of A. M must be:
% 'auto' - (default) Places missing elements last for ascending sort
% and first for descending sort.
% 'first' - Places missing elements first.
% 'last' - Places missing elements last.
%
% B = SORT(A,...,'ComparisonMethod',C) specifies how to sort complex
% numbers. The comparison method C must be:
% 'auto' - (default) Sorts real numbers according to 'real', and
% complex numbers according to 'abs'.
% 'real' - Sorts according to REAL(A). Elements with equal real parts
% are then sorted by IMAG(A).
% 'abs' - Sorts according to ABS(A). Elements with equal magnitudes
% are then sorted by ANGLE(A).
%
% [B,I] = SORT(A,...) also returns a sort index I which specifies how the
% elements of A were rearranged to obtain the sorted output B:
% - If A is a vector, then B = A(I).
% - If A is an m-by-n matrix and DIM = 1, then
% for j = 1:n, B(:,j) = A(I(:,j),j); end
%
% The sort ordering is stable. Namely, when more than one element has the
% same value, the order of the equal elements is preserved in the sorted
% output B and the indices I relating to equal elements are ascending.
%
% Examples:
% % Sort a vector in ascending order
% sort([0 3 1 0 2 0 1 6])
% % Sort each column or row of a matrix
% A = [3 7 5; 0 4 2]
% B1 = sort(A,1) % sort each column
% B2 = sort(A,2) % sort each row
% % Sort complex numbers according to their real part
% A = [1+1j ; 1-1j ; -2-2j ; 0 ; -2+2j]
% B = sort(A,'ComparisonMethod','real')
%
% See also ISSORTED, SORTROWS, MIN, MAX, MINK, MAXK.
% Copyright 1984-2017 The MathWorks, Inc.
% Built-in function.
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Answers (1)
Hiroyuki Hishida
on 7 Sep 2021
Machida様、
こちらが参考になると思います。 https://jp.mathworks.com/help/matlab/ref/open.html#bu_46i9-2
ただし、関数によっては、実装コードを閲覧することができないものもございます。それらは、高速化等を目的にバイナリ化されてるためです。もし、今確認されたい関数sortがこれに該当する場合は、閲覧方法はございませんことを、予めご了承ください。
何か特殊事情がある場合、担当営業に相談されるのも一つかと思います。
どうぞよろしくお願いします。
菱田
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