# Screen: wrong window position in large external display **URL:** https://psychtoolbox.discourse.group/t/screen-wrong-window-position-in-large-external-display/11 **Category:** Uncategorized **Created:** [November 12, 2019, 3:42pm UTC](https://psychtoolbox.discourse.group/t/screen-wrong-window-position-in-large-external-display/11 "2019-11-12T15:42:06Z") **Posts on this page:** 1 **Page:** 1
### Author: ![denispelli](https://avatars.discourse-cdn.com/v4/letter/d/cdc98d/32.png) [@denispelli](https://psychtoolbox.discourse.group/u/denispelli) #### Post date: [November 12, 2019, 3:42pm UTC](https://psychtoolbox.discourse.group/t/screen-wrong-window-position-in-large-external-display/11/1 "2019-11-12T15:42:06Z")
Dear Mario and friends Two glitches in Screen OpenWindow. BUG 1: MacBook Pro with large external LG Screen attached through USB C port. When I try to open a full-screen window on screen 1, without specifying a rect, I get a full screen window, as expected. However, when I add the rect argument, specifying the full screen, i get a window of the right size, but offset left by half a screen, so i only see the right half of the window, and the right half of the screen remains black. Weirdly, from software, I can't tell that anything's wrong, as the Screen('Rect',window) and Screen('GlobalRect',window) are the same as for a proper full-screen window. % Without the rect argument, it works as expected. r=Screen('Rect',screen); screen=1; white=255; window=Screen('OpenWindow',screen,white); sca % However, using the rect argument gives a window % that is only half on the screen. window=Screen('OpenWindow',screen,white,r); r = 0 038402160 Screen('Rect',window) ans = 0 038402160 Screen('Rect',window) ans = 0 038402160 Screen('GlobalRect',window) ans = 0 038402160 BUG 2: providing an empty rect, crashes MATLAB. window=Screen('OpenWindow',screen,white,[]); Here's my configuration: model: 'MacBookPro14,3' modelDescription: 'MacBook Pro (15-inch, 2017)' manufacturer: 'Apple Inc.' psychtoolbox: 'Psychtoolbox 3.0.16' matlab: 'MATLAB 9.6 (R2019a)' system: 'macOS 10.14.6' screenMex: 'Screen.mexmaci64 07-Aug-2019' screens: [0 1] screen: 0 size: [2100 3360] nativeSize: [2100 3360] mm: [206 330] openGLRenderer: 'AMD Radeon Pro 560 OpenGL Engine' openGLVendor: 'ATI Technologies Inc.' openGLVersion: '2.1 ATI-2.11.20' psychtoolboxKernelDriver: 'PsychtoolboxKernelDriver 1.1' drawTextPlugin: 1 psychPortAudio: 1 summary: 'MacBookPro14,3-macOS-10.14.6-PTB-3.0.16' Best Denis | | | ![photo](https://ec.yimg.com/ec?url=https%3A%2F%2Fs3.amazonaws.com%2Fucwebapp.wisestamp.com%2F887691c9-4947-4f2c-9c88-27e316257a00%2F032_Colorcropped.format_png.resize_200x.png%23logo&t=1575346081&sig=2A7GeDIfLuQbrh0sMkXSnw--~E) | | **Denis Pelli** Professor of Psychology & Neural Science, New York University | +1-646-258-7524| [denis.pelli@...](mailto:denis.pelli@...) | | [http://psych.nyu.edu/pelli/](http://psych.nyu.edu/pelli/)| Skype: denispelli | | | [http://denispelli.com](http://denispelli.com) | | [![](https://ec.yimg.com/ec?url=https%3A%2F%2Fcdn.gifo.wisestamp.com%2Fsocial%2Ffacebook%2F3b5998%2F16%2F0.png&t=1575346081&sig=g5Ik7UxA9yAksy_8ej203g--~E)](http://www.facebook.com/denispelli) | [![](https://ec.yimg.com/ec?url=https%3A%2F%2Fcdn.gifo.wisestamp.com%2Fsocial%2Flinkedin%2F0077b5%2F16%2F0.png&t=1575346081&sig=QW_hxDf7lwYvW3GPbpYSXw--~E)](http://www.linkedin.com/in/denispelli/) | [![](https://ec.yimg.com/ec?url=https%3A%2F%2Fcdn.gifo.wisestamp.com%2Fsocial%2Ftwitter%2F55acee%2F16%2F0.png&t=1575346081&sig=wwJlYhLTuhOauag8PYQhNQ--~E)](http://twitter.com/denispelli) | | | | | |