411 REFERENCE · Wikibooks
MATLAB Programming/Psychtoolbox/Screen Commands/ClearScreen
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Usage:
Screen(windowPtr,'FillRect',[color],[rect])
Fill rect. color is the clut index (scalar or [r g b] triplet) that you want to poke into each pixel; default produces white with the standard CLUT for this window's pixelSize. Default rect is entire screen, so you can use this function to clear the screen.