Retrieve "cycles" or a variable for the number of cycles in a block loop

Michif

Hi,

there is a thing that is bugging me for a while: I often need the number of cycles of e.g. my experimental block. That is, I want to have a variable telling me the number of trials in my block(s). Defining it myself for every experiment is very error prone since I may do changes in the block item but forget to adjust my variable.
I wonder, therefore, is there any such variable? When looking into the script of the block item, I see there is a variable called cycles which does just that. But it seems I cannot call it (at least not with var. or var.get(...)).
Is there any way to retrieve the value of cycles? If not, is there another variable indicating the cycles of a block that I can retrieve? If not either, it would be great to be able to or to have one!

Michel

Jarik

Hi Michel,

Maybe this helps:
http://forum.cogsci.nl/index.php?p=/discussion/comment/7750/#Comment_7750

Best,
Jarik

Michif

Thanks, Jarik! That helps a lot!

sebastiaan

Hi Michel,

As of OpenSesame 3.1, the loop uses DataMatrix, a convenient data structure that allows you to do all kinds of things with your loop table. Let's say that you want to get the length of block_loop:

block_loop_len = len(items['block_loop'].live_dm)

For more information, see:

• http://osdoc.cogsci.nl/3.1/manual/structure/loop/#accessing-the-loop-table-in-python-inline-script
• http://datamatrix.cogsci.nl/

Cheers,
Sebastiaan