Custom functions in Pavlovia

[verdi]

Hi,

I’m trying to custom define a function which I then use in Python in an auto->JS code component. However, I’m getting the ‘reference error: can’t find variable x’ for the function name. I’ve seen here that I should define it in my JS code block. However, this isn’t working for me. Are there any ideas about how I could do this?

Many thanks

[wakecarter]

How have you worded the function definition?

Is it in Before or Begin Experiment?

JS function not recognised

Try putting your function definitions in Before Experiment or assigning them to a variable name varInstance = function(variability, scaling, shift)

[verdi]

It is in before experiment. i.e.:

and then I try to use it in a later code component here:

but even though it is defined in the previous code block, it claims it isn’t recognised…

[wakecarter]

The syntax you are using Before Experiment is the version I use in Begin Experiment.

In Before Experiment I tend to write the function in Python. Try moving your code to Begin Experiment.

[verdi]

Thank you. When you write the function in Python, how do you then make sure that it translates this to JS so you can use it in Pavlovia?

[wakecarter]

Start by trying something in this format in an Auto Translate component.

def functionName(x):
     do stuff
     return functionOutput

If it doesn’t translate automatically you need to switch the component to Both to edit the JavaScript.