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SignalProcessing

  

TriangleWindow

  

multiply an array of samples by a triangular windowing function

 

Calling Sequence

Parameters

Options

Description

Thread Safety

Examples

Compatibility

Calling Sequence

TriangleWindow(A)

Parameters

A

-

Array of real or complex numeric values; the signal

Options

• 

container : Array, predefined Array for holding results

• 

inplace : truefalse, specifies that output should overwrite input

Description

• 

The TriangleWindow(A) command multiplies the Array A by the triangular windowing function and returns the result in an Array having the same length.

• 

The triangular windowing function wk is defined as follows for a sample with N points.

piecewise1km&comma;km&comma;m<kN&comma;wNk1

• 

where m=N2 for even N, and m=N212 for odd N.

• 

Before the code performing the computation runs, A is converted to datatype float[8] or complex[8] if it does not have one of those datatypes already. For this reason, it is most efficient if A has one of these datatypes beforehand. This does not apply if inplace is true.

• 

If the container=C option is provided, then the results are put into C and C is returned. With this option, no additional memory is allocated to store the result. The container must be an Array of the same size and datatype as A.

• 

If the inplace or inplace=true option is provided, then A is overwritten with the results. In this case, the container option is ignored.

Thread Safety

• 

The SignalProcessing[TriangleWindow] command is thread-safe as of Maple 18.

• 

For more information on thread safety, see index/threadsafe.

Examples

with( SignalProcessing ):

N := 1024;

N1024

(1)

s1 := TriangleWindow( Array( 1 .. N, fill = 1 ) );

_rtable18446884321097780510

(2)

dataplot( s1, style = line );

s2 := TriangleWindow( Array( 1 .. N, i -> sin(i*0.1) ) );

_rtable18446884321097764366

(3)

dataplot( s2, style = line );

 

Compatibility

• 

The SignalProcessing[TriangleWindow] command was introduced in Maple 18.

• 

For more information on Maple 18 changes, see Updates in Maple 18.

See Also

SignalProcessing