converting sym function to string MATLAB

Question

Andromeda 2021-10-17

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评论： Walter Roberson 2023-5-22

I am attempting to convert a symbolic expression to a string using the function sym2str but I am getting an error. How can I convert a symbolic expression to a string? See attachment below

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Answer 1

Star Strider 2021-10-17

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https://ww2.mathworks.cn/matlabcentral/answers/1565691-converting-sym-function-to-string-matlab#answer_810336

在 MATLAB Online 中打开

Try this —

syms x y 
eqn = x^2+2*x*y+3*y^2;
partial_eqn = diff(eqn, x);
fprintf("The partial derivative of %s w.r.t. x is %s \n", string(eqn), string(partial_eqn))
The partial derivative of 2*x*y + x^2 + 3*y^2 w.r.t. x is 2*x + 2*y 

Also, using fprintf is easier and creates a more pleasing result.

.

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Star Strider 2023-5-22

@Jagan — I suppose that it depends on what you are converting. This approach works here.

If you have a specific problem, it would be best for you to post it as a new Question, along with the sym expression you want to convert.

Walter Roberson 2023-5-22

string() should give you the same printable representation that displaying at the command line gives.

Note however, that the printable representation is not necessarily something that can be executed as MATLAB code or as symbolic code or as the internal MuPAD symbolic language. The printable display of symbolic functions and symbolic expressions is intended for human understanding, not for machine execution.

If you are looking for something that has to be machine executable then use matlabFunction after which you can use func2str

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