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>  Docs Center  >  IDL Reference  >  Math - Wavelets  >  WV_FN_HAAR

### 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 return the Result structure using the default Order.

None.

## Version History

 5.3 Introduced

## Resources and References

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