Whats wrong with this code?
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N = 25;
sigmaratio = 0.01;
PD = zeros(1,1000);
SNR = zeros(1,1000);
PF = 0.00001;
count = 0;
for sigmaratio=0.01:0.01:10
count=count+1;
TH = sqrt(sigmaratio/N) * chi2inv(PF);
SNR(count) = 10*log10(sigmaratio);
PD(count) = chi2cdf(PF)*(TH/(sigmaratio+1));
end
figure;
plot(SNR, PD, 'b-');
xlabel('Signal to noise ratio(DB)');
ylabel('Probability of detection, PD');
hold on;
PF = PF*10;
count = 0;
for sigmaratio=0.01:0.01:10
count=count+1;
TH = sqrt(sigmaratio/N) * chi2inv(PF);
PD(count) = chi2cdf(PF)*(TH/(sigmaratio+1));
end
plot(SNR, PD, 'b-');
hold on;
PF = PF*10;
count = 0;
for sigmaratio=0.01:0.01:10
count=count+1;
TH = sqrt(sigmaratio/N) * chi2inv(PF);
PD(count) = chi2cdf(PF)*(TH/(sigmaratio+1));
end
plot(SNR, PD, 'b-');
hold on;
PF = PF*10;
count = 0;
for sigmaratio=0.01:0.01:10
count=count+1;
TH = sqrt(sigmaratio/N) * chi2inv(PF);
PD(count) = chi2cdf(PF)*(TH/(sigmaratio+1));
end
plot(SNR, PD, 'b-');
hold on;
PF = PF*10;
count = 0;
for sigmaratio=0.01:0.01:10
count=count+1;
TH = sqrt(sigmaratio/N) * chi2inv(PF);
PD(count) = chi2cdf(PF)*(TH/(sigmaratio+1));
end
plot(SNR, PD, 'b-');
hold on;
1 个评论
Stephen23
2016-7-20
"Whats wrong with this code?"
No comments, no explanation, no introduction, no help, no examples, no idea what it should do...
采纳的回答
dpb
2016-7-20
Trying to run it, I get--
...
Error using chi2inv (line 22)
Requires two input arguments.
>>
Don't know what the intent is and with, as you note Stephen, no explanations, I'm not going to try to divine but need a DOF argument as the second argument to chi2inv
Whether that should be N or perhaps count OP will have to determine...
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