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i want to plot the graph between the probability of false alarm and probability of detection

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ahmed
ahmed 2012-12-15
clear; L=3; a=1; N=1000; Ns=3; f1=0.05; v=0.2985; %db2mag gi=1; gl=1; gj=1; w=0; sigm=0; for i=1:L sigma(i)=0.5*(gi)^2; sigm=sigm+sigma(i); end; for n=1:L rs(n)=sigm^2*(Ns-n)/Ns; pl(n)=rs(n); pc(n)=rs(n).*cos(2*pi*f1*n); end ps=0; for l=1:L p(l)=gl*pl(l)*cos(w*l); ps=ps+p(l); end
q=0; for i=1:L for j=1:L if j>i; break
q1(i,j)=0.5*gi*(pc(i-j)+pc(i+j))*gj;
q=q+q1(i,j);
end
end
end %p0=qfunc*(y.*(((y.^2)+sigma)/n).^(-0.5));
for e=1:1:10
y(e)=(qfuncinv(e)).*sqrt((0.5*a)./(N-((qfuncinv(e)).^2))); %lamda
z(e)=(((1+v)*y(e).^2)-(4*ps*v*y(e))+(sigma+q*v))/(N*(v+1)^2);
u1=ps*v/(v+1);
p1(e)=qfunc((y(e)-u1)/sqrt(z(e)^2*(y(e))));
end
plot(p0,p1,'b*'); grid;

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回答（1 个）

Matt Fig
Matt Fig 2012-12-15
  1. Format your code.
  2. Give a description of what it does and what is wrong
  3. State clearly what you need it to do.
  2 个评论
ahmed
ahmed 2012-12-15
this is m file matlab program and this is the code which i do it and this is amistake in line 46 this code for plot graph between probability of false alarm and probability of detection in cognative radio
Image Analyst
Image Analyst 2012-12-15
编辑：Image Analyst 2012-12-15
But why won't you tell us what the error is???? When I copied and pasted your code into a blank m-file, line 47 was a blank line so I can't even guess what the error is, and I can't even run it because you forgot to list what toolbox was required - the one that has function qfuncinv - so I wasted my time even trying to find out what the error was. Why do you make it hard on us to help you?
Perhaps this will help: http://www.mathworks.com/matlabcentral/answers/?term=roc+curve

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