showing images randomly from the same category

MicolG

Hello everyone!

I've been using Open Sesame for a while now, so I've decided to start programming my experiment.

Firstly, I uploaded a bunch of different images which can actually be grouped into six different categories, and I expect that Open Sesame would randomly display one image from each category.

For the sake of clarity, I uploaded 5 different happy faces, which I named as happy-1, happy-2, happy-3, happy-4, and happy-5. I would expect that one of them would be randomly picked everytime I called for the happy condition to be showed.

Thus, I was thinking of coding something like that:

draw image center=1 file="[category_name[random1,5]]". 

It does not work, though.

What would you suggest that I do?

I would really appreciate if you could help me

sebastiaan

Hi @MicolG ,

I would start by adding a short inline_script at the start of the trial sequence where you determine the file name based on the category_name variable and a randomly selected digit between 1 and 5 (inclusive). This should be in the prepare phase.

import random
var.my_image_file = '{}{}'.format(var.category_name, random.randint(1, 5))

And then you can use the variable my_image_file in the script of your sketchpad :

draw image center=1 file=[my_image_file]

Do you see the logic? And note that the two scripts use a different language: Python for the inline_script and OpenSesame script for the sketchpad script.

-- Sebastiaan

MicolG

Thank you @sebastiaan , I definetely got your point.

Could you tell me what syntax should I use for OSWeb (javascript)?

sebastiaan

Hi @MicolG ,

In JavaScript (i.e. an inline_javascript item) the logic is the same, but the details of the implementation are a bit different. Specifically, there is no randint() function in JavaScript, so you need to implement it yourself.

function randomInteger(minval, maxval) {
    return minval + Math.floor(Math.random() * (maxval - minval + 1))

}
vars.my_image_file = vars.category_name + randomInteger(1, 5)
console.log(vars.my_image_file)

—Sebastiaan

MicolG

Thank you so much,

You've helped me a great deal!

MG