C09CBF computes the inverse one-dimensional discrete wavelet transform (DWT) at a single level. The initialization routine
C09AAF must be called first to set up the DWT options.
C09CBF performs the inverse operation of
C09CAF. That is, given sets of
${n}_{c}$ approximation coefficients and detail coefficients, computed by
C09CAF using a DWT as set up by the initialization routine
C09AAF, on a real data array of length
$n$, C09CBF will reconstruct the data array
${y}_{i}$, for
$\mathit{i}=1,2,\dots ,n$,
from which the coefficients were derived.
None.
If on entry
${\mathbf{IFAIL}}={\mathbf{0}}$ or
${-{\mathbf{1}}}$, explanatory error messages are output on the current error message unit (as defined by
X04AAF).
The accuracy of the wavelet transform depends only on the floating point operations used in the convolution and downsampling and should thus be close to machine precision.
None.