Hi,
i've created an hidden question ( type is multiple choice), i would use a random number to get one of the subanswers and to print this in another question (boilerplate question).

it is possible to use something like this:

{A0FB=FBPNOT_SQ + rand(1,43) + .question}

A0FB is a boilerplate question

FBPNOT is the multiple question, with 43 subanswers.

_SQ1 to _SQ43 are the subanswers.

Or is it possible to set a variable, e.g. number=rand(1,43) and after use "if"


thanks in advance.

Marco

marcomarenco wrote: i would use a random number to get one of the subanswer to print this subanswer in another question.

{A0FB=FBPNOT_SQ + rand(1,43) + .question}

You cannot take a value of a variable and use it create another variable NAME.
FBPNOT_SQ+rand(1,43)+.question will not be seen as one variable.


In other tools you would even not need to use a hidden question.
You would just create a static list and choose one item via one command randomly.
See feature request for dynamic / static list here:
bugs.limesurvey.org/view.php?id=11688


Workaround
You want one answer randomly assigned to a variable, which you can display somewhere in another question.
First I would create a separate equation question which just contains rand(1,43) to save the random number.

Approach 1:
Nested ifs with 43 answers depending on random number
www.limesurvey.org/manual/Expression_Man...Conditional_Logic.29

Approach 2:
Assign a default answer via random number
www.limesurvey.org/manual/Expression_Man..._Assignment_Operator

solved in this way:
{A0FB=if(is_empty(A0.NAOK), if((rand(1,43)==1),FBPNOT_SQ1.question,if((rand(1,43)=),FBPNOT_SQ3.question,if((rand(1,43)==4),FBPNOT_SQ4.question,if((rand(1,43)==5),FBPNOT_SQ5.question,if((rand(1,43)==6),FBPNOT_SQ6.question,if((rand(1,43)==7),FBPNOT_SQ7.question,if((rand(1,43)==,FBPNOT_SQ8.question,if((rand(1,43)==9),FBPNOT_SQ9.question,if((rand(1,43)==10),FBPNOT_SQ10.question,if((rand(1,43)==11),FBPNOT_SQ11.question,if((rand(1,43)==12),FBPNOT_SQ12.question,if((rand(1,43)==13),FBPNOT_SQ13.question,if((rand(1,43)==14),FBPNOT_SQ14.question,if((rand(1,43)==15),FBPNOT_SQ15.question,if((rand(1,43)==16),FBPNOT_SQ16.question,if((rand(1,43)==17),FBPNOT_SQ17.question,if((rand(1,43)==18),FBPNOT_SQ18.question,if((rand(1,43)==19),FBPNOT_SQ19.question,if((rand(1,43)==20),FBPNOT_SQ20.question,if((rand(1,43)==21),FBPNOT_SQ21.question,if((rand(1,43)==22),FBPNOT_SQ22.question,if((rand(1,43)==23),FBPNOT_SQ23.question,if((rand(1,43)==24),FBPNOT_SQ24.question,if((rand(1,43)==25),FBPNOT_SQ25.question,if((rand(1,43)==26),FBPNOT_SQ26.question,if((rand(1,43)==27),FBPNOT_SQ27.question,if((rand(1,43)==28),FBPNOT_SQ28.question,if((rand(1,43)==29),FBPNOT_SQ29.question,if((rand(1,43)==30),FBPNOT_SQ30.question,if((rand(1,43)==31),FBPNOT_SQ31.question,if((rand(1,43)==32),FBPNOT_SQ32.question,if((rand(1,43)==33),FBPNOT_SQ33.question,if((rand(1,43)==34)FBPNOT_SQ34.question,if((rand(1,43)==35),FBPNOT_SQ35.question,if((rand(1,43)==36),FBPNOT_SQ36.question,if((rand(1,43)==37),FBPNOT_SQ37.question,if((rand(1,43)==38),FBPNOT_SQ38.question,if((rand(1,43)==39),FBPNOT_SQ39.question,if((rand(1,40)==2),FBPNOT_SQ40.question,if((rand(1,43)==41),FBPNOT_SQ41.question,if((rand(1,43)==42),FBPNOT_SQ42.question,if((rand(1,43)==43),FBPNOT_SQ43.question,if((rand(1,43)==2),FBPNOT_SQ2.question,FBPNOT_SQ2.question))))))))))))))))))))))))))))))))))))))))))), if((rand(1,43)==1),FBPOK_SQ1.question,if((rand(1,43)=),FBPOK_SQ3.question,if((rand(1,43)==4),FBPOK_SQ4.question,if((rand(1,43)==5),FBPOK_SQ5.question,if((rand(1,43)==6),FBPOK_SQ6.question,if((rand(1,43)==7),FBPOK_SQ7.question,if((rand(1,43)==,FBPOK_SQ8.question,if((rand(1,43)==9),FBPOK_SQ9.question,if((rand(1,43)==10),FBPOK_SQ10.question,if((rand(1,43)==11),FBPOK_SQ11.question,if((rand(1,43)==12),FBPOK_SQ12.question,if((rand(1,43)==13),FBPOK_SQ13.question,if((rand(1,43)==14),FBPOK_SQ14.question,if((rand(1,43)==15),FBPOK_SQ15.question,if((rand(1,43)==16),FBPOK_SQ16.question,if((rand(1,43)==17),FBPOK_SQ17.question,if((rand(1,43)==18),FBPOK_SQ18.question,if((rand(1,43)==19),FBPOK_SQ19.question,if((rand(1,43)==20),FBPOK_SQ20.question,if((rand(1,43)==21),FBPOK_SQ21.question,if((rand(1,43)==22),FBPOK_SQ22.question,if((rand(1,43)==23),FBPOK_SQ23.question,if((rand(1,43)==24),FBPOK_SQ24.question,if((rand(1,43)==25),FBPOK_SQ25.question,if((rand(1,43)==26),FBPOK_SQ26.question,if((rand(1,43)==27),FBPOK_SQ27.question,if((rand(1,43)==28),FBPOK_SQ28.question,if((rand(1,43)==29),FBPOK_SQ29.question,if((rand(1,43)==30),FBPOK_SQ30.question,if((rand(1,43)==31),FBPOK_SQ31.question,if((rand(1,43)==32),FBPOK_SQ32.question,if((rand(1,43)==33),FBPOK_SQ33.question,if((rand(1,43)==34)FBPOK_SQ34.question,if((rand(1,43)==35),FBPOK_SQ35.question,if((rand(1,43)==36),FBPOK_SQ36.question,if((rand(1,43)==37),FBPOK_SQ37.question,if((rand(1,43)==38),FBPOK_SQ38.question,if((rand(1,43)==39),FBPOK_SQ39.question,if((rand(1,40)==2),FBPOK_SQ40.question,if((rand(1,43)==41),FBPOK_SQ41.question,if((rand(1,43)==42),FBPOK_SQ42.question,if((rand(1,43)==43),FBPOK_SQ43.question,if((rand(1,43)==2),FBPOK_SQ2.question,FBPOK_SQ2.question))))))))))))))))))))))))))))))))))))))))))))}

Well, I would be surprised if you get a even distributed exposure of questions.

You let choose the random number 43 times in the equation.
Since the nested ifs are evaluated in a sequential way, you most likely will end up with a lot of chosen questions in the higher range. E.g. rand=1 could only be choosen, if the 42 other rand(1,43) are no matching in the next 42 times. That is very uncommon.

To ensure a evenly distribution of random number, you should create a equation question and use rand(1,43) one time. This equation question code should replace the rand(1,43) in your nested if.
The performance be will better too, since a random number is calculated one time only.

yes, everytime i create a random number, maybe it needs a little time more, and it needs more resource (not so much). in this way i try to simulate a number create randomly. the last "if" is fixed, so something appear on the screen, maybe to be more sure that i can match the random number with a if statement, i've to duplicate the same condition 2 or 3 times.

i'm trying someother way to solve this
bye

marcomarenco wrote: in this way i try to simulate a number create randomly.

Your approach is having a bias.
You're not getting a more random number if you generate a new random number with every if.
You get the opposite, since the order of the nested if is always from 1 to 43.

I was wrong about the higher range, since "nested if" stops if one "if" is true.
The order of "nested if" determinate the chances of getting chosen.

You have FBPNOT_SQ43.question,if((rand(1,43)==2),FBPNOT_SQ2.question,FBPNOT_SQ2.question at the end of the first "nested if".

To get a "if((rand(1,43)==2),FBPNOT_SQ2.question" the 41 ifs before have to be FALSE in addition.
To get a "if((rand(1,43)==1),FBPNOT_SQ1.question" only this needs to be true.
So the chances of getting question2 is a lot lower that getting question1.
Not sure why you put question2 at the end of the nested if. But good for testing.

maybe i've found another way:
1. create an hidden equation question (the first) named "random".
2. in another question (boilerplate) es. A0FB, in relevance i've put: random=rand(1, 43)

now i can check the value of random to print a random feedback.

what do you think?

Marco

marcomarenco wrote: maybe i've found another way:
1. create an hidden equation question (the first) named "random".

You've completely lost me. Last attempt with a clean sheet.

You want to display a question-text (randomly chosen from 43 questions texts) in a boilerplate question.

Simplest way:

1. Question:
Type: Equation question
Name: randnumber
Questiontext
if( ! is_empty(randnumber), randnumber, rand(1,43))

2. Question:
Type: Boilerplate

Questiontext:
{if randnumber=1,"Questiontext1-...sdsdjkadljsdlsjdsad",""}
{if randnumber=2,"Questiontext2-...sdsdjkadljsdlsjdsad",""}
etc..

To access FBPNOT_SQ1.question etc. you can use
{if randnumber=1,FBPNOT_SQ1.question,""}
{if randnumber=2,FBPNOT_SQ2.question,""}


If you want something completely different you might explain your task again and attach a surveyfile to this thread.

i try to explain, it's a survey with anagrams to solve, i use short text and regular expression to check if the person find the right solution. there are 30 anagrams, and for every anagrams there's a verbal feedback (boilerpalte question) and i would that this fb are choosen randomly from list (now there are 43 feedback if the person find the solution, 43 if he don't find the solution).
i need that this feedback are different everytime, this is the reason of this post.
in my first attempt i follow this example:
survey-consulting.com/how-to-randomly-sh...a-limesurvey-survey/

and it's similar to your solution, i've tried to use, but the randnumber question was always the same, i need that the random number change for every feedback, i'm trying now and if i put in relevance equation:
randnumber=rand(1,43)
it changes.

thanks for your help
Marco