Thresholding then proceeds by initializing the vector block and coefficient indices and then computing {HEAD ~ the vector length} as {TAIL ~ the square root} of the sum of squares of the vectors component values  
as
Thresholding then proceeds by initializing the vector block and coefficient indices and then computing { HEAD ~ the vector length } as { TAIL ~ the square root } of the sum of squares of the vectors component values
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH