Routines (alphabetical) > Routines: W > WV_FN_HAAR

# WV_FN_HAAR

The WV_FN_HAAR function constructs wavelet coefficients for the Haar wavelet function.

Note: The Haar wavelet is the same as the Daubechies wavelet of order 1.

## Syntax

Result = WV_FN_HAAR( [Order, Scaling, Wavelet, Ioff, Joff] )

## Return Value

The returned value of this function is an anonymous structure of information about the particular wavelet.

Tag | Type | Definition
FAMILY | STRING | ‘Haar’
ORDER_NAME | STRING | ‘Order’
ORDER_RANGE | INTARR(3) | [1, 1, 1] Valid order range [first, last, default]
ORDER | INT | 1
DISCRETE | INT | 1 [0=continuous, 1=discrete]
ORTHOGONAL | INT | 1 [0=nonorthogonal, 1=orthogonal]
SYMMETRIC | INT | 0 [0=asymmetric, 1=symm., 2=near symm.]
SUPPORT | INT | 1 [Compact support width]
MOMENTS | INT | 1 [Number of vanishing moments]
REGULARITY | DOUBLE | 0d [Number of continuous derivatives]

## Arguments

### Order

A scalar that specifies the order number for the wavelet. The default is 1.

### Scaling

On output, contains a vector of double-precision scaling (father) coefficients.

### Wavelet

On output, contains a vector of double-precision wavelet (mother) coefficients.

### Ioff

On output, contains an integer that specifies the support offset for Scaling.

### Joff

On output, contains an integer that specifies the support offset for Wavelet.

Note: If none of the above arguments are present then the function will simply return the Result structure using the default Order.

## Keywords

None.

## Version History

5.3 | Introduced

## Resources and References

Daubechies, I., 1992: Ten Lectures on Wavelets, SIAM.

## See Also

WV_DWT, WV_FN_COIFLET, WV_FN_DAUBECHIES, WV_FN_SYMLET