Convert a symbolic expression to string

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Saikat Banerjee
Saikat Banerjee 2018-11-23
评论： Rajan Prasad 2022-8-7
I haVE A SYMBOLIC EXPRESSION WHICHI WANT TO USE AS A STRING EXPRESSION WITHOUT EVALUATING IT. EXAMPLE IF I HAVE
A=9
B=5
IF WE WRITE STRING(A+B-(A*B) ) WE GET ANSWER -31
BUT I WANT 9+5-(9*5) . HOW TO DO IT

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回答（3 个）

madhan ravi
madhan ravi 2018-11-23
编辑：madhan ravi 2018-11-23
Walter Roberson
Walter Roberson 2018-11-23
https://www.mathworks.com/help/matlab/ref/compose.html
As you appear to want to use string objects use compose()
  2 个评论
Walter Roberson
Walter Roberson 2022-8-7
Ran in:
Since R2019b, you can do
A=9
A = 9
B=5
B = 5
displayFormula('A+B-(A*B)')
Notice that the () disappeared though.
Walter Roberson
Walter Roberson 2022-8-7
Ran in:
A = 9; B = 5;
str = 'A+B-(A*B)/GRAB'
str = 'A+B-(A*B)/GRAB'
regexprep(str, {'\<A\>', '\<B\>'}, {num2str(A), num2str(B)})
ans = '9+5-(9*5)/GRAB'
The \< and \> are there to force it to replace only when the names are the entire "word" -- the A and B inside of GRAB should not be replaced

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Rajan Prasad
Rajan Prasad 2022-8-7
Use string() command. This will convert the symbolic expression into string and then you can export into any format.
  2 个评论
Walter Roberson
Walter Roberson 2022-8-7
That will not work to prevent evaluation of the expression while still substituting in values of the variables.
Rajan Prasad
Rajan Prasad 2022-8-7
The string command will convert the symbolic expression into string. Instead of typing/entering the symbolic expression agian, one can use string. Then can use regexprep as suggested by you to replace the desired string to get in the string format with value.

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