Why i get different output?

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aerun martin
aerun martin 2014-12-24
回答： Star Strider 2014-12-24
n=-10:10;
g1=-2*(n<=-5);
g2=n.*(n==-4);
g3=n.*(n==-3);
g4=n.*(n==-2);
g5=n.*(n==-1);
g6=n.*(n==0);
g7=(4./n).*(n>=1);
G=g1+g2+g3+g4+g5+g6+g7;
subplot(3,2,1);
stem(n,G,'r','filled','linewidth',1)
xlabel('n');
ylabel('G[n]');
title ('G[n] against n');
this is my code. i suppose to get as below.

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回答（1 个）

Star Strider
Star Strider 2014-12-24
There may be better solutions, but the easiest way I can think of the avoid the NaN at 0 is simply to add eps to ‘n’ in the denominator of ‘g7’:
g7=(4./(n+eps)).*(n>=1);
since that is generating it.

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