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Random value re-computed? Ramdomization over groups.

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1 year 10 months ago #251500 by Jmantysalo
Random value re-computed? Ramdomization over groups. was created by Jmantysalo
I want to make a survey where by random either question A in group X or question B in group Y is shown. I think I could just use a hidden question of type equation "rand(1,2)" and show a question A if it was 1, question B if it was 2. But it does not work, it seems that the random number will be re-computed every time a new group is loaded. A bug or feature? If the latter, can I make something else, like taking last digit of seconds when the survey started?

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1 year 10 months ago #251502 by tpartner
Replied by tpartner on topic Random value re-computed? Ramdomization over groups.
You need to test for an existing value. If, for example, you have question code "random1", the equation would be:
Code:
if(is_empty(random1), rand(1,2), random1)
Cheers,
Tony Partner
Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.
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1 year 10 months ago - 1 year 10 months ago #251503 by Joffm
Replied by Joffm on topic Random value re-computed? Ramdomization over groups.
Hi,
exactly. Each click changes the random number.

IF you create it as you did. Only {rand(1,2)}
To avoid this, use the construct that is shown here "more than 1000 times"
[img

{if(is_empty(random),rand(1,2),random)}

Only as long as the random number is empty, it will be calculated. If not, it keeps its value.

Joffm

@tpartner beat me by two minutes.
 
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Last edit: 1 year 10 months ago by Joffm.
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