hi guys, I'm calculating False rate and miss rate but when I use wi =1:160 for false rate and wi=160+1 according to the code below my wi matrix is empty [] consequently I dont get results expected may someone tell me where I'm writing wrong

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Rui Mauaie 2018-11-6

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评论： Rui Mauaie 2018-11-6

%%false alarm rate
falseTa=0;
falseQa=0;
for wi=1:160
    if T1(wi)>Ta
        falseTa=falseTa+1;
    end 
    falserate_kpca_Ta=100*falseTa/160;
    if Q1(wi)>Qa
        falseQa=falseQa+1;
    end 
    falserate_kpca_Qa=100*falseQa/160;
end 
missTa=0;
missQa=0;
for wi=160+1:size(T1,2)
    if T1(wi)<Ta
        missTa=missTa+1;
    end
    if Q1(wi)<Qa
        missQa=missQa+1;
    end 
end
missrate_kpca_Ta=100*missTa/(size(T1,2)-160);
missrate_kpca_Qa=100*missQa/(size(T1,2)-160);

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KSSV 2018-11-6

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Undefined function or variable 'Q1'.

Rui Mauaie 2018-11-6

the value of Q1 I already calculated it

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KSSV 2018-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/428230-hi-guys-i-m-calculating-false-rate-and-miss-rate-but-when-i-use-wi-1-160-for-false-rate-and-wi-160#answer_345408

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wi=160+1:size(T1,2)

The above is not correct...

The above gives result obviously empty. Because you cannot generate any numbers between 161:1...I guess you should use:

wi=160+1:-1:size(T1,2)

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KSSV 2018-11-6

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What you want it to be? It is easy to understand...

size of T1 is 961*1

wi=160+1:size(T1,1) => wi = 161:961

The above gives wi as 1*801.

Rui Mauaie 2018-11-6

You are right but according to what you wrote the final result should be 161:961 (that range), but I have 961 not that range!! I think should go deep to understand. thanks

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