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How to display the celcius sumbol (°C) using fprint??

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Fotis 2015 年 6 月 23 日
Commented: Walter Roberson 2019 年 12 月 4 日
I am creating an output file using fprint and want to display the unit of temperature in Celcius. Anyone knows how to do this?

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Stephen Cobeldick
Stephen Cobeldick 2015 年 6 月 23 日
編集済み: Stephen Cobeldick 2019 年 12 月 4 日
Here are four methods:
fid = fopen('temp.txt','wt');
fprintf(fid,'symbol one: °C\n');
fprintf(fid,'symbol two: %cC\n',176);
fprintf(fid,'symbol three: %cC\n',char(176));
fprintf(fid,'symbol four: \260C\n');
And the generated file:
symbol one: °C
symbol two: °C
symbol three: °C
symbol four: °C
EDIT: Added octal syntax based on Walter Roberson's comment.

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Walter Roberson
Walter Roberson 2015 年 6 月 23 日
Another couple of variations:
fprintf(fid,'Ambient Temperature \t\t\t [\260] \t : \t %0.1f \n',T.amb-273.15);
fprintf(fid,'Ambient Temperature \t\t\t [\xB0] \t : \t %0.1f \n',T.amb-273.15);
Caution: If you were trying to produce the output °C then \260C will work but \xB0C will not, as it will not be able to tell that the C is not intended to be part of the hex sequence.
Michael 2019 年 12 月 3 日
Out of curiosity, where do the codes in Walter's helpful comment come from? I knew that the degree symbol could be produced by Alt + 0176 so it didn't surprise me that passing 176 to a %c in fprintf gave me the right symbol.
>> fprintf('%c\n',176)
However, for my particular application, I can avoid needing to add a cumbersome workaround if I could put the symbol right in the format string. But these didn't give me what I expected:
>> fprintf('\176\n')
>> fprintf('\x176\n')
>> fprintf('\0176\n')
>> fprintf('\x0176\n')
Obviously using the code Walter suggested worked, but how did you know the degree symbol was \260?
>> fprintf('\260\n')
Stephen Cobeldick
Stephen Cobeldick 2019 年 12 月 4 日
"but how did you know the degree symbol was \260?"
Simply convert decimal to octal: 176 (decimal) = 260 (octal).
The fprintf documentation give two syntaxes for specifying any unicode character directly:
  • using hexadecimal '\xN'
  • using octal '\N'
The value 176 is decimal, so it cannot be used directly with either of those syntaxes, but if you convert it to the correct base it it will work exactly as documented (although watch out for the catch that Walter Roberson showed when using hexadecimal with a trailing 'C' character).

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More Answers (1)

Ingrid 2015 年 6 月 23 日
first search the previous answers and you will find what you are looking for:
I prefer to use:

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Stephen Cobeldick
Stephen Cobeldick 2015 年 6 月 23 日
The syntax ^{\circ} applies to MATLAB text objects (e.g. title, etc) using the TeX or LaTeX interpreters, not to fprintf as the OP is asking about.
Walter Roberson
Walter Roberson 2019 年 12 月 4 日
\circ is also a work-around. I am told that publications do not like \circ as it is not considered a correct degree symbol. I seem to recall it is not raised at the correct height for a proper degree symbol.

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