Problem controlling a loop using "selected rows" with a variable that is defined in a previous routine (ONLINE)

Online experiments
1

URL of experiment:
https://gitlab.pavlovia.org/harry_witchel/mw-28-8-20-4-07pm/blob/master/html/goNoGo_2020-08-26_mental_effort.js

Description of the problem:

Hi all,

My experiment works perfectly well when running it locally via python.

I am trying to control a loop (“block”) in psychopy builder with a variable that is defined in a code component in “plan1” (the previous routine), which is outside the “block” loop - see below (rowsFromLearningBlock):

image
image1439×347 28.8 KB

image
image1171×580 57.9 KB

image
image762×540 68.8 KB

image
image1920×1069 97.8 KB

I have tried to use the window object (“window.rowsFromLearningBlock”) in order to make the variable global, but this hasn’t worked either. I have tried without the $ sign, but this also doesn’t work. The only solution I can see is duplicating the routines for each trial and discarding the current loops, in order to have a new conditions file with the correct rows defined for each one. However, I would rather not do this as there is a lot of trials.

Thank you for any help.

2

Given your error message I wouldn’t assume a scope issue here.

I think the input for Selected rows in the loop has to be a string.
Given the screenshot of your code I don’t really know whether that’s the case.

You can maybe try something like this:

startB = startRowBlock.toString();
endB = endRowBlock.toString();
CondRows = startB + ":" + endB;

with CondRows as variable to enter in Selected rows.

3

Hi, thank you for the reply.

I just tried this and got exactly the same error as the one I originally posted. It seems like the array still isn’t being recognised as valid. I’ve included a screenshot of the conditions file if it helps.

image
image1177×590 67.3 KB

image
image756×544 58.4 KB

image
image927×513 12.6 KB

After the error occurs, doing console.log(rowsFromLearningBlock) returns “0:0” - is this where it is becoming invalid length? The intention is just to select the first row of the conditions file because later on, I want to select multiple rows.

I have tested inputting “0:0” in to the selected rows box and I get the same invalid length error, whereas I get no error when inputting “0:1”. I believe that this may be the source. Is there an alternative to just select the first row using this code?

Thanks again.

4

Yep.
Since the last number in “0:0” or “0:1” is not included in the generated sequence of numbers you basically select no row in case of “0:0” (0:1 evalualtes to 0).

I assume if you entered for example 9 in the rowBlockEnd column of your condition file the 9th row should be included as well?
If that’s the case you could either change your condition file by adding 1 to every entry in the rowBlockEnd column or add 1 to the variable endB.

5

Thanks!