hann — Generate a Hann window as an N-by-1 real column vector.

hann generates Hann windows for signal-processing workflows such as spectral analysis and filter design. RunMat supports the common MATLAB call forms for symmetric and periodic windows, including optional single-precision output.

How hann works in RunMat

• hann(L) returns an L x 1 symmetric Hann window.
• hann(L, 'periodic') returns the periodic form used in spectral-analysis workflows.
• hann(..., 'single') returns a single-precision window; 'double' is the default.
• If L is noninteger, RunMat rounds it to the nearest integer before constructing the window.
• hann(0) returns an empty 0 x 1 tensor.
• hann(1) returns 1.
• For the symmetric case and L > 1, coefficients follow 0.5 - 0.5*cos(2*pi*n/(L-1)).
• The periodic form is constructed by evaluating a symmetric window of length L + 1 and dropping the final sample.

Examples

Generate a short Hann window

w = hann(8);
disp(w')

Generate a periodic Hann window for spectral analysis

w = hann(8, 'periodic');
disp(w')

Generate a single-precision Hann window

w = hann(8, 'single');
class(w)

FAQ

What is the difference between the symmetric and periodic Hann window?

Use the default symmetric window for filter-design style workflows. Use 'periodic' for spectral analysis, where MATLAB and RunMat construct a symmetric window of length L + 1 and drop the last sample so the sequence matches the periodicity assumptions of the DFT.

What shape does hann(L) return?

It returns an L x 1 column vector, matching MATLAB's window-function convention.

Does hann support single precision?

Yes. Pass 'single' as the final option to request a single-precision output. The default output type is double precision.

Related functions to explore

These functions work well alongside hann. Each page has runnable examples you can try in the browser.

hamming, blackman, fft

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