which encoding should i used with fopen in matlab

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rakia belgacem
rakia belgacem 2019-11-5
回答： Saurabh 2025-6-18
the instruction :
fullpathr = strcat (exp_subfolder,tmf_file)
fidr = fopen(fullpathr,r,'ieee-le','UCS-2')
i want to open and read a file in matlab but always it return -1 and warning "the encoding UTF-16 is not supported"
please can any one help me in this
  1 个评论
Walter Roberson
Walter Roberson 2025-6-17
This is because MATLAB only officially supports UTF-8 encoding with 'fopen'.
Not exactly. MATLAB supports a long list of encodings, mostly ISO. However, it does not officially support UTF-16

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回答（1 个）

Saurabh
Saurabh 2025-6-18
Hi @rakia belgacem,
I understand you are encountering an issue opening a UCS‑2 (or UTF‑16) encoded file in MATLAB. This is because MATLAB only officially supports UTF-8 encoding with 'fopen'. While encodings like UCS-2, UTF-16LE are not officially supported.
To workaround this limitation:
Read raw bytes and Decode explicitly.
fid = fopen(fullpathr, 'rb');
fread(fid, 2, '*uint8'); % Skip BOM
bytes = fread(fid, 'uint8=>uint8')';
fclose(fid);
str = native2unicode(bytes, 'UTF-16LE');
data = textscan(str, '%s %f %f', 'Delimiter', ',', 'HeaderLines', 1);
This method reads raw bytes, manually decodes them using native2unicode, and then parses the resulting string.
  • 'native2unicode' converts byte arrays to MATLAB character arrays based on the specified encoding (UTF-16LE, UTF-8, etc.)
  • This approach handles files with 16-bit encoding reliably, avoiding issues from fopen’s limited encoding support .
To know more about 'native2unicode' refer to the following official MathWorks documentation:
https://www.mathworks.com/help/matlab/ref/native2unicode.html
I hope this helps in resolving your query.

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