xbasc - clear a graphics window and erase the associated recorded graphics
Without any argument, this function clears the current graphics window and erases the recorded graphics. Otherwise it clears the graphics windows whose numbers are included in the vector window-id, and erases the corresponding recorded graphics. For example xbasc(1:3) clears windows 1, 2 and 3 and erases the corresponding recorded graphics. If one of the windows does not exist, then it is automatically created.