How do I print a mixed expression ( numeric and symbolic) to a file?

Question

Jonathan Dentch 2014-3-27

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回答： Star Strider 2014-3-28

Example: 3.21 - x

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Star Strider 2014-3-28

How do you generate your expressions? Symbolic Math Toolbox? Something else?

Jonathan Dentch 2014-3-28

在 MATLAB Online 中打开

A = [1,2;3,4];
// Greek letter xi
xi = sym('xi');
B = [xi,0;0,xi];
C = A - B;
fprintf(fid,C(:,:));

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Answer 1

Salaheddin Hosseinzadeh 2014-3-27

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在 MATLAB Online 中打开

You can use sprintf or easier way is to concatnate strins

myString=sprintf();
fprintf(myFile,myString);

or

fprintf(myFile,[num2str(myNumber),' - x']);

and then write the 'mySring' to a file.

I personally never used sprintf , so for furter details abou sprintf refer to MALAB help

doc sprintf

Good Luck!

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Jonathan Dentch 2014-3-27

How do I print a mixed expression in general ? The expression might contain several numerics and several symbolics in any order.

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Answer 2

Salaheddin Hosseinzadeh 2014-3-28

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The only way that I know of is to concatnate just as I showed u! I edited a whole bunch of text files like this.

I don't think if there would be another way around. Just to make it more automatic you may put your strins in a cell array, and also the digits, and use a for loop to do it easier!

names={'Alex','Sam','Max','Sala','Tom','Tim'};
examResult=(20 10 4 13 5 0);
for i= 1:lenght(examResult)
 fprintf(myFile,[names(i),'''s exam result=',num2str(i)]);
end

output

Alex's exam result= 20

Sory if it is difficult, sometime I'm looking for super easy ways that does not exits. I don't think if an specific way would exis for you.

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Jonathan Dentch 2014-3-28

Thanks for your help, Salaheddin. However, I do not know the exact composition of the mixed expression (i.e., one numeric followed by an operator followed by one symbolic). Your example contains no symbolics. MATLAB is able to print a mixed expression to the command window. Surely, there must be a way to print the same expression to a file.

A = [1,2;3,4]; xi = sym('xi'); // Greek letter xi B = [xi,0;0,xi]; C = A - B; fprintf(fid,C(:,:));

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Answer 3

Star Strider 2014-3-28

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https://ww2.mathworks.cn/matlabcentral/answers/123386-how-do-i-print-a-mixed-expression-numeric-and-symbolic-to-a-file#answer_131031

在 MATLAB Online 中打开

The only MATLAB functions I can find that deal with unicode characters are unicode2native (and native2unicode that may not apply to what you are doing but has a link at the end of the unicode2native page).

Consider this for a start, and experiment:

bytes = unicode2native('Ξ ξ')