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function w = nuttallwin (m, opt)
funcprot(0);
rhs= argn(2);
if (rhs < 1 | rhs > 2)
error("Wrong Number of input arguments");
end
if (~ (isscalar (m) & (m == fix (m)) & (m > 0)))
error ("nuttallwin: M must be a positive integer");
end
N = m - 1;
if (rhs == 2)
select (opt)
case "periodic"
N = m;
case "symmetric"
N = m-1;
else
error ('nuttallwin: window type must be either periodic or symmetric");
end
end
if (m == 1)
w = 1;
else
a0 = 0.355768;
a1 = 0.487396;
a2 = 0.144232;
a3 = 0.012604;
// n = [-N/2:(m-1)/2]';
// w = a0 + a1.*cos(2.*%pi.*n./N) + a2.*cos(4.*%pi.*n./N) + a3.*cos(6.*%pi.*n./N);
n=[0:m-1]'
w = a0 - a1.*cos(2.*%pi.*n./N) + a2.*cos(4.*%pi.*n./N) - a3.*cos(6.*%pi.*n./N);
end
endfunction
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