WA Set Coefficients of 1D Discrete Wavelet Transform (Array) VI
- Updated2024-07-30
- 3 minute(s) read
Sets approximation or detail discrete wavelet transform (DWT) coefficients at a specific level. Use the WA Discrete Wavelet Transform VI to compute the DWT. Use the WA Get Coefficients of Discrete Wavelet Transform VI to obtain the DWT coefficients.

Inputs/Outputs
![]() coef type specifies whether this VI sets the approximation coefficients or detail coefficients. The default is Approximation coefficients. ![]() DWT coef specifies the approximation coefficients and the detail coefficients from the multi-level discrete wavelet decomposition (DWT). You must organize the coefficients into a 1D real array starting with the approximation coefficients at the largest level followed by the detail coefficients at all levels in descending order. ![]() length specifies, in a 1D array, the number of approximation and detail coefficients at each level. At a decomposition level of N, length is equal to N+2. The first element of length always is equal to the number of approximation coefficients. The last element of length indicates the total number of raw data samples. You must arrange the length of the detail coefficients in descending order. ![]() coef level specifies the coefficient level this VI sets. The coef level must be between 1 and the largest level of the detail coefficients. The levels in the WA Discrete Wavelet Transform VI specifies the largest level of the coefficients. The default is 1, which means this VI sets the coefficients at level 1. ![]() error in describes error conditions that occur before this node runs. This input provides standard error in functionality. ![]() new DWT coef specifies the discrete wavelet transform (DWT) coefficients to set. ![]() DWT coef out returns the discrete wavelet transform (DWT) coefficients set to new DWT coef at the coef type and coef level. ![]() length out returns length unchanged. ![]() error out contains error information. This output provides standard error out functionality. |
Examples
Refer to the following VIs for examples of using the WA Set Coefficients of Discrete Wavelet Transform VI:
- Get and Set Approximation Coefficients VI: labview\examples\Wavelet Analysis\WAGettingStarted
- Get and Set Single Level Detail Coefficients VI: labview\examples\Wavelet Analysis\WAGettingStarted