Investment Studio > Expressions > Functions > DSP > BLACKMAN

Vector form: float array[1][length] blackman(integer length)

Returns a row vector (one row, length columns) containing the values of a Blackman window starting at position 1 and ending at position length > 1.
Scalar form: float blackman(integer length, integer position)

Returns the value in position >= 1 of a Blackman window starting at position 1 and ending at position length > 1.

The Blackman window function is defined as

omega = 2.0 * PI / (length - 1)

n = position - 1

blackman[n] = 0.42 - 0.5 * cos(n * omega) + 0.08 * cos(n * 2.0 * omega)

Example

The graph source

=blackman(100, x)

can be used to create the following graph:

See also convolve, hamming, hanning, rectangle, triangle.