Convert a symbolic expression to string
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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
回答（3 个）
madhan ravi
2018-11-23
编辑：madhan ravi
2018-11-23
0 个投票
Walter Roberson
2018-11-23
0 个投票
As you appear to want to use string objects use compose()
2 个评论
Since R2019b, you can do
A=9
B=5
displayFormula('A+B-(A*B)')
Notice that the () disappeared though.
A = 9; B = 5;
str = 'A+B-(A*B)/GRAB'
regexprep(str, {'\<A\>', '\<B\>'}, {num2str(A), num2str(B)})
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
Rajan Prasad
2022-8-7
0 个投票
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
2022-8-7
That will not work to prevent evaluation of the expression while still substituting in values of the variables.
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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2018-11-23
2022-8-7
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