Cuboid descriptor that is a combination of 'who' doing 'what'. Concatenates descriptor of first, middle, and last frame with motion descriptor of cuboid. INPUTS I - MxNxT double array (cuboid) with most vals in range [-1,1] who_imdesc - frame appearance descriptor what_desc - cuboid motion descriptor whoweight - multiplier for frame appearance importance [0 and inf are special] OUTPUTS desc - 1xp feature vector See also IMAGEDESC, IMAGEDESC_CH2DESC