Inverse function to genvarname, matlab.lang.makeValidName(Str,"ReplacementStyle","hex")

Question

Jörg von Mankowski 2019-7-8

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470666-inverse-function-to-genvarname-matlab-lang-makevalidname-str-replacementstyle-hex

编辑： Stephen23 2022-5-26

I need to use the field names of a structure to automatically generate some plot legends. Therefor I would need a function that converts a string containing hexadecimal representations of a character back to the character. Example.

VarName = genvarname("Alpha-Bravo")

VarName % Alpha0x2DBravo

Str = theSearchedFunction(VarName, ...)

Str % Alpha-Bravo

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Stephen23 2022-5-24

编辑：Stephen23 2022-5-26

在 MATLAB Online 中打开

There is no general solution to this, e.g. it is impossible to distinguish between these two:

genvarname("-")
ans = "x0x2D"
genvarname("x0x2D")
ans = "x0x2D"

If you can place some restrictions on the characters, then it might be possible.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Oisín Watkins 2022-5-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/470666-inverse-function-to-genvarname-matlab-lang-makevalidname-str-replacementstyle-hex#answer_970955

在 MATLAB Online 中打开

I had this same problem, but in my case the hex string was only ever 2 charaters long, eg: '0x26' or '0x27'.

I made a simple enough function to search out those substrings, split the input string by that deliminator, then convert the deliminator and concatonate the result back in. This also works for strings with multiple hex segments. At the end all remaining characters are concatonated onto the output string.

function [output_str] = getvarname(input_str)
%getvarname undos the conversion performed by genvarname
idx = strfind(input_str, '0x');
str_to_search = input_str;
output_str = "";
for i=1:length(idx)
    deliminator = input_str(idx(i):idx(i)+3);
    str_parts = split(str_to_search, deliminator);
    
    character = char(hex2dec(input_str(idx(i)+2:idx(i)+3)));
    
    output_str = strcat(output_str, str_parts{1}, character);
    
    str_to_search = str_parts{2};
end
output_str = strcat(output_str, input_str(idx(end)+4:end));
end