Help with Screen: Display only shows the upper left quadrant on the screen

Programming Help
1

Hi,

I am experiencing a problem while trying to draw on the display. It seems that the Screen function creates a window with the correct size by reading the correct screen resolution but it only lets me see what is drawn in the upper left quadrant, which takes up the whole display. When I am connected to an external monitor, I don’t have this issue.

For example, the screen resolution is 2560x1600 pixels. If the coordinates of the rectangle I want to draw takes up the whole screen, with the following coordinates: {(0,0), (2560,0), (2560,1600),(0,1600)}, then I can only see a portion of this rectangle with the coordinates {(0,0), (1280,0), (1280,800),(0,800)} on the display.

I have MATLAB 2019a with Psychtoolbox 3.0.16 - Flavor: beta on a Macbook pro with MacOS Mojave 10.14.6. Any ideas why I am experiencing this issue?

Thanks in advance.

2

The high level reason is because you use Apples trainwreck of an operating system, instead of a real operating system.

But more specifically this might help:

3

This helped, thanks!