Problem in exporting function expression

Dear all

I get a function cd(x,y).I would like to export this function expression like this form:x^2+y^3... .What shall I do?

Part of a function expression:

Answer 1

[Rahul]

Hi @duty duty,

I understand that you require to export your function expression comining x,y variables in the expression form as indicated in the question. In MATLAB, you can make use of 'syms' command to define Symbolic Scalar Variables and Functions. Here is an example:

syms x y
cd = -((x^2 + y^2)^(1/2)*(-(79819630675297226055697*x^2*y^2)/364791569817010176000 + (29968083657371368688627119*x^2*y^4)/))... % your expression

cd_str = char(cd);

% Exporting this expression in a text file
fileID = fopen('cd_expression.txt', 'w');
fprintf(fileID, '%s\n', cd_str);
fclose(fileID);

% This expression can be then converted from 'char' to function expression
% by using 'str2sym' function
exp = str2sym(cd_str);

Refer to the following MathWorks documentations to know more:

'syms': https://www-test1.mathworks.com/help/releases/R2017b/symbolic/syms.html

'str2sym': https://www-test1.mathworks.com/help/releases/R2017b/symbolic/str2sym.html

Hope this helps. Thanks!