How to compare letters if they are same

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Ivan Mich
Ivan Mich 2021-1-19
评论： Rik 2021-1-21
Hello
I have a problem with a code. I would like to compare two files with letters/names. I would like to find which name of file 2 corresponds to the name of file 1 , depending on the name similarity.
I mean I would like to match names from one file name to another file name.
Which command should I use?
Thank you in advance
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Rik
Rik 2021-1-21
@Ivan Mich You know this forum. After 89 questions you should know we don't like people deleting parts of the question. Please don't do that. You are only giving people work to recover what you deleted, making your deletion pointless as well.

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回答（2 个）

Walter Roberson
Walter Roberson 2021-1-20
Ran in:
Typically the easiest way to handle situations like this, that are not plain upper / lower case (use upper() or lower() or strcmpi() for those), is to create a mapping table,
%I only partly filled this out; see
%https://en.wikipedia.org/wiki/Greek_script_in_Unicode
map = char(0x001:0x03ff);
%https://www.unicode.org/charts/PDF/U0370.pdf
map(0x0391:0x03a9) = 0x03b1:0x03c9; %alpha to omega upper to lower ΑΩ αω
map(0x0386) = 0x03b1; % Ά
map(0x0388) = 0x03b5; % Έ
map(0x0389) = 0x03b7; % Ή
map(0x038A) = 0x03b9; % Ί
map(0x038C) = 0x03b9; % Ό
map(0x038E) = 0x03c5; % Ύ
map(0x038F) = 0x03c9; % Ώ
map(0x03AC) = 0x03b1; % ἀ
map(0x03AD) = 0x03b5; % ἐ
map(0x03AE) = 0x03b7; % ἠ
map(0x03AF) = 0x03b9; % ἰ
%https://www.unicode.org/charts/PDF/U0080.pdf
map(0x00b5) = 0x03bc; %mu
%https://en.wikipedia.org/wiki/Greek_Extended
map(0x1f00:0x1f0f) = 0x03b1; %alpha extended
map(0x1f10:0x1f1f) = 0x03b5; %epsilon extended
map(0x1f20:0x1f2f) = 0x03b7; %eta extended
%and more
After which you take
map('Αθήνα')
ans = 'αθηνα'
map('ΑΘΗΝΑ')
ans = 'αθηνα'
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Walter Roberson
Walter Roberson 2021-1-20
Your version did not have hex input yet.
In each place that I coded 0x followed by digits, convert that to a call to hex2dec() with the digits in quotes. You might need to remove the 0x part. For example
map = char(hex2dec('0001'):hex2dec('03ff'));
You can skip the leading 0, such as hex2dec('3ff') but using the leading 0 helps to emphasize that you are using Unicode code points, which by convention are given in 4 digit hex until 0x10000
Walter Roberson
Walter Roberson 2021-1-20
%I only partly filled this out; see
%https://en.wikipedia.org/wiki/Greek_script_in_Unicode
H = @hex2dec;
map = char(H('0001'):H('03ff'));
%https://www.unicode.org/charts/PDF/U0370.pdf
map(H('0391'):H('03a9')) = H('03b1:H('03c9; %alpha to omega upper to lower ΑΩ αω
map(H('0386')) = H('03b1'); % Ά
map(H('0388')) = H('03b5'); % Έ
map(H('0389')) = H('03b7'); % Ή
map(H('038A')) = H('03b9'); % Ί
map(H('038C')) = H('03b9'); % Ό
map(H('038E')) = H('03c5'); % Ύ
map(H('038F')) = H('03c9'); % Ώ
map(H('03AC')) = H('03b1'); % ἀ
map(H('03AD')) = H('03b5'); % ἐ
map(H('03AE')) = H('03b7'); % ἠ
map(H('03AF')) = H('03b9'); % ἰ
%https://www.unicode.org/charts/PDF/U0080.pdf
map(H('00b5')) = H('03bc'); %mu
%https://en.wikipedia.org/wiki/Greek_Extended
map(H('1f00'):H('1f0f')) = H('03b1'); %alpha extended
map(H('1f10'):H('1f1f')) = H('03b5'); %epsilon extended
map(H('1f20'):H('1f2f')) = H('03b7'); %eta extended
%and more

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Stephen23
Stephen23 2021-1-20
编辑：Stephen23 2021-1-20
Ran in:
Rather than building maps by hand, I would get Python to do the heavy lifting, e.g.:
baz = @(v)char(v(1)); % only need the first decomposed character.
fun = @(c)baz(py.unicodedata.normalize('NFKD',c)); % to remove diacritics.
in1 = 'Αθήνα';
in2 = 'ΑΘΗΝΑ';
st1 = arrayfun(fun,in1) % remove diacritics
st1 = 'Αθηνα'
st2 = arrayfun(fun,in2) % remove diacritics
st2 = 'ΑΘΗΝΑ'
strcmpi(st1,st2) % case-insensitive comparison
ans = logical
1

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