Need help with presenting two stimuli at the same time

Hi guys,

Before we begin I should explain I'm very new to matlab and have zero programming experience. As in, i'm a physician and I suck at this.

Anyway I'm kind of diving into this face-first. I'm trying to set up a task that presents two stimuli at once (from a set of four pictures). Door 1, will return a reward 80% of the time and a neutral picture 20% of the time. Door 2 will be 20% reward and 80% neutral, and Doors 3 and 4 will both return 50% reward and 50% neutral.

Here is what I have so far but I know that its completely wrong (also the doors are on top of one another but I can't seem to get them to display properly) and I can't figure out where to go from here. I've tried googling it but I keep going in circles.

%%present picture

      img_rot = imread('door1.bmp'); 

      img_text_rot = Screen('MakeTexture', w, img_rot);                       

      Screen('DrawTexture', w, img_text_rot, [], [50,50,164,312]);

      img_rot = imread('door2.bmp');

      img_text_rot = Screen('MakeTexture', w, img_rot);                       

      Screen('DrawTexture', w, img_text_rot, [], [100,50,164,312]);

      Screen('Close', img_text_rot);

      Screen('Flip', w);

      WaitSecs(0.15);

I can't even get the stimuli to display properly, I haven't even gotten to figuring out how to set up the outcomes (reward vs neutral outcome). Any advice??

Thanks in advance