Why symvar() sort 10 smaller than 9

2 次查看（过去 30 天）
Chen Bo-Yang
Chen Bo-Yang 2021-4-9
评论： Walter Roberson 2021-4-12
My variables is X = X1 X2 ... X9 X10,but when I use symvar(X),I get X1 X10 X2 ... X9。
How can I sort it from small to large?

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2021-4-9
Ran in:
symvar() sorts inconsistently if I recall correctly. It gets complicated when you start mixing numbers and underscores.
For the simple case that does not involve underscores, symvar() sorts by unicode code point
alpha = evalin(symengine, '`α`'); %unicode U+03B1
lambda = evalin(symengine, '`λ`'); %unicode U+03BB
beta = evalin(symengine, '`β`'); %unicode U+03B2
chi = evalin(symengine, '`χ`'); %unicode U+03C7
symvar([alpha,chi,lambda,beta])
ans = 
and '1' is before '2' in unicode, so X1anything occurs before X2anything
See https://www.mathworks.com/matlabcentral/fileexchange/34464-customizable-natural-order-sort
  2 个评论
Chen Bo-Yang
Chen Bo-Yang 2021-4-11
Thanks for your answer and I use sort() to solve my problem.
Walter Roberson
Walter Roberson 2021-4-12
sort() will sort by unicode code point -- but at least sort() would be consistent about what happens if you mix numbers and underscores.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Shifting and Sorting Matrices 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by