How can I sort strings using only a piece of them?

Question

Keanu Guardiola Flores 2018-1-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/379807-how-can-i-sort-strings-using-only-a-piece-of-them

编辑： Walter Roberson 2018-1-30

I have an array of strings in the format 'text#_text#. I want Matlab to be able to recognize the numbers in the strings so I can rearrange them in whichever order I decide. How can I go about doing this? # is any random whole number

Example:

A = (e12_u1, e3_u1, e3_u2, e13_u1)
B = (e6_u1, e4,u1, e4_u2, e13_u1)

No matter if I give A or B, I want the program to be able to recognize the numbers and order them, for example, in the following way:

(e12, e11, e9, e4, e3, e8, e1, e10, e2, e5, e6, e7) and place a zero if the number is not there.

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Answer 1

Guillaume 2018-1-30

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https://ww2.mathworks.cn/matlabcentral/answers/379807-how-can-i-sort-strings-using-only-a-piece-of-them#answer_302550

在 MATLAB Online 中打开

Note: when giving examples it really helps if you use valid matlab syntax so

we can just copy/paste your example into matlab without having to type anything
there's no ambiguity on the type of input and output
we don't have to guess what place a 0 in (e12, e11, e9, e4, e3, e8, e1, e10, e2, e5, e6, e7) actually mean. (I've no idea there!)

A = {'e12_u1', 'e3_u1', 'zz7_g4'}
number = str2double(regexp(A, '\d+', 'match', 'once'));  %the regexp extract the first string of digits from each char array.
[~, order] = sort(number, 'desc');
A(order)