repl.txt

{{alias}}( N, workspace, strideW, offsetW )
    Initializes a workspace array for performing a real-valued Fourier
    transform.

    The workspace array is divided into three sections:

    1. scratch/workspace: the section ranges from indices 0 to N-1 and is used
        while performing transforms. This section is not updated during
        initialization.

    2. twiddle factors: the section ranges from indices N to 2N-1 and stores a
        table of reusable complex exponential constants as cosine/sine pairs.

    3. radix factor table: the section starts at index 2N and stores the
        sequence length N, the number of factors into which N was decomposed,
        and the individual integer radix factors.

    Any remaining array space remains as unused storage.

    Parameters
    ----------
    N: integer
        Length of the sequence.

    workspace: ArrayLikeObject<number>
        Workspace array.

    strideW: integer
        Stride length for `workspace`.

    offsetW: integer
        Starting index for `workspace`.

    Examples
    --------
    > var {{alias:@stdlib/array/float64}} = require( '@stdlib/array/float64' );
    > var N = 8;
    > var workspace = new {{alias:@stdlib/array/float64}}( ( 2*N ) + 34 );
    > {{alias}}( N, workspace, 1, 0 );
    > var twiddleFactors = workspace.slice( N, 2*N )
    <Float64Array>[ 0, ~0.707, ~0.707, 0, 0, 0, 0, 0 ]
    > var factors = workspace.slice( 2*N, ( 2*N ) + 4 )
    <Float64Array>[ 8, 2, 2, 4 ]

    See Also
    --------