Hi all,

I´ve created a mathematical quiz. In the end each participant gets displayed a summary of his anwers so that he can check if they are correct.

In the quiz there is a an open question.

On the picture below, the correct answer is entered. You can see that there are already some symbols underlined.



In the end of the survey the answer is displayed with errors.




This is my syntax for the summary of this question:

You answered: {A2.shown}

Please check if you answered correctly.


There doesn´t seem to be any problem about the syntax. When I insert eg. "apple" as answer for question no. 2 the same text is displayed in the question summary. So this problem just occurs for formulae like {∅, {a}, {{b}}, {a, {b}}}.


Do you know if there is any way to display the formula correctly in the summary? Does my syntax needs to be extended?

Thanks a lot for your support since I don´t have any starting point to solve this problem.

Below, please find the lss




Kind regards

Maria

I don't see that equation anywhere in the attached survey.

If you want Expression Manager to ignore curly braces, insert a space after the opening brace and before the closing brace.

Hello, Maria,

well it's quite obvious.
To display the answer you have to use curly brackets. But your answer itself contains the mathematical symbols "{" and "}" to indicate the set.

There is a way to display:
Have a space after the "{" and before the "}

Then you get (just an example):


So with some equations and string functions replace "{" by "{ " and "}" by " }"

Like this:
After A2 insert a question of type equation (hidden) and enter
{A2=str_replace('{','{ ',A2)}
{A2=str_replace('}',' }',A2)}

Viel Erfolg
Joffm

+1 to the responses from above.

If you don't add the space, LimeSurvey interprets what is inside curly brackets as an expression. That is why you also get the respective error message:

www.limesurvey.org/manual/Expression_Man...elopers#How_EM_Works

You should also be able to use { and } - brajeshwar.github.io/entities/

I really think it's an issue … Expression Manager must not replace value from user entered variable …
But must test if able to allow it in equation at the same time.

Edit : reported and assigned : bugs.limesurvey.org/view.php?id=14698

Thanks a lot tpartner, I didn´t know this tip (inserting a space) before.

Hi Joffm,

thanks a lot for your helpful tip. I inserted two equations like proposed and now it´s working. The replace function might be very helpul for future surveys

Beste Grüße und einen schönen Abend

Maria