Direct Restruction
Y=upcoef(type,x,wname,[N],[L]) Y=upcoef(type,x,Lo_R,Hi_R,[N],[L])
upcoef is for upward reconstruction from any desired input vector.
x=rand(1,100); [cA,cD]=dwt(x,'db2'); Y=upcoef('a',cA,'db2',1); Z=upcoef('a',cA,'db2',3);
Roger Liu and Isaac Zhi