Hi,
in my questionnaire I have an equation-type question "Valence" containing {rand(1,2)}.

In a subsequent question, I want to load one of three random images associated to this condition:
However, when I test the question group, I just get "2<span id='LEMtailor_Q_33821_52'>neg</span>.jpg" as a response and the browser can't load the image. I then placed the equation in a group before the one containing the picture. This time an image was displayed, but completely unrelated to the condition from the valence-variable (e.g. "1" resulted both in "pos" and in "neg").

Am I doing something wrong?

Thank you for your help!
Benny

Hi, Benny
if I understand your condition right, you have 6 pictures.
1. the rand(1,3)
2. the valence that is rand(1,2)
So you want to get
1pos.jpg, 1neg.jpg, 2pos.jpg, 2neg.jpg, 3pos.jpg and 3neg.jpg

Well, I do not see any issue when I include the following in the question text.
<img alt="" src=" www.myserver.de/Holiday/Boat00{rand(1,4)}_small.jpg " />
It is not exactly your condition, but it shows that the random function works.

Have alook into the source code of the question (the span-tag looks suspicious)

Best regards
Joffm

Actually, the rand(1,3) function works for me as well – it is always the picture with the generated number in its name. The problem is the second condition pos/neg as the question simply doesn't seem to care what number the previous equation-type question rolled. The span-issue has also been reported in other threads (e.g. here ). The span is not part of the source code, but is generated when the question is loaded in the browser.

Try placing something like this in an equation type question (let's call it "equation1"):
Then you should be able to insert the image where required like this:

Thank you for the suggestion, Tony! I created equation1 as instructed an inserted the "{html_entity_decode(equation1)}" tag in the following question. This time, the image loads correctly without generating the span, but the "pos" or "neg" attribute still appears to be completely unrelated to the content of the variable "Valence" being 1 or 2. That is, for 1 I get both "pos" and "neg" images and vice versa. :blink:

Do you perhaps have any idea what's going wrong here?

If "Valence" is conditional, you may need to use this IF statement:
Other than that, all I can suggest is placing that IF statement in a separate equation type question to try and debug it.

Thanks again. Valence is always computed so that the .NAOK-statement should not be necessary, but I tried it nonetheless. Placing the if-statement in an external equation (and having the value show up in the survey for debugging) yields the same result: The "pos" or "neg" is unrelated to the content of the Valence variable ... I am really not sure what to debug here as I am absolutely sure that (this very simple) if-statement is correct.

Can you attach a small test survey containing only the related questions?

Here's the survey - it's still very small as I am still trying to figure out the randomization.

Thank you in advance!

It looks like the equation in Valence may be fired more than once. To ensure that a random number is only generated once, use this in Valence: