1-D approximation coefficients extraction
A=appcoef(C,L,wname,[N]) A=appcoef(C,L,Lo_R,Hi_R,[N])
wavelet name, haar( "haar"), daubechies ("db1" to "db20"), coiflets ("coif1" to "coif5"), symlets ("sym2" to "sym20"), legendre ("leg1" to "leg9"), bathlets("bath4.0" to "bath4.15" and "bath6.0" to "bath6.15"), dmey ("dmey"), beyklin ("beylkin"), vaidyanathan ("vaidyanathan"), biorthogonal B-spline wavelets ("bior1.1" to "bior6.8"), "rbior1.1" to "rbior6.8"
extracted approximation coefficients
lowpass synthesis filter
highpass syntheis filter
coefficent array
length array
restruction level with N<=length(L)-2
appcoef can be used for extraction or reconstruction of approximation coefficents at level N after a multiple level decompostion. Extension mode is stored as a global variable and could be changed with dwtmode. If N is omitted, the maximum level (length(L)-2) is used.
The length of A depends on the level N.
C and L can be generated using wavedec.