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Blackman Window Function
 Syntax `y = blackman(N)` Syntax `y = blackman(N,M)` Include: `include spt\blackman.oms` See Also Other Window Functions
``` ARGUMENTS:    INPUTS:       N = SCALAR, any numerical type, >=2. Represents the row           dimension of the requested window. Coerced to INTEGER           before local processing.       M = SCALAR, any numerical type, >=1. Represents the column           dimension of the matrix returned. Coerced to INTEGER           before local processing.    RETURN: MATRIX, DOUBLE, N-point Blackman window in each column. ```
Description ``` ```Create a N-by-M Blackman data window matrix. This function returns a MATRIX where each column is a Blackman windowing function of row dimension N. Argument M, which is optional, is used to specify the column dimension for a matrix return. M omitted or M=1 returns a column vector. M<1 returns novalue. N value must be 2 or greater or novalue is returned. N and M may be any numerical type and are coerced to INTEGER before local processing. The return type is DOUBLE.

Example
Make and plot a BLACKMAN window function. ``` N      = 128;                 # Window length header = sprintf(": N = %d",N); header = [name,header]; h      = blackman(N); t      = seq(N)-1d0; ``` ``` ```