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Posted at 2008/09/07 10:22 // in 전자 공학/Matlab // by downright

정의:

특성:

기본함수:(matlab 내장)
function y=diric(x,N) error(nargchk(2,2,nargin,'struct')); if round(N) ~= N || N < 1 || numel(N) ~= 1, error(generatemsgid('MustBePosInteger'),'Requires N to be a positive integer.'); end y=sin(.5*x); i=find(abs(y)>1e-12); % set where x is not divisible by 2 pi j=1:length(x(:)); j(i)=[]; % complement set y(i)=sin((N/2)*x(i))./(N*y(i)); y(j)=sign(cos(x(j)*((N+1)/2)));
그래프:
t=[-3*pi:0.01:3*pi]; y=5*diric(t,5);y2=11*diric(t,11); hold on plot(t,y,'b-'), plot(t,y2,'r') axis([-3*pi,3*pi,-5,12]), title('Dirichlet Kernel Function'), grid on legend('diric(t,5)','diric(t,11)') hold off

* 참고: http://en.wikipedia.org/wiki/Dirichlet_kernel