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

%%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);

[Stephan]

Formatted Version of the code:

%%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);

Please provide T1

[Rui Mauaie]

the size of T1 is 961*1

[Rui Mauaie]

Ta = 35.2433 Qa=1.48*10^-8

[KSSV]

Undefined function or variable 'Q1'.

[Rui Mauaie]

the value of Q1 I already calculated it

Answer 1

[KSSV]

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)

[Rui Mauaie]

I tried your code but for wi I got 1, the size of T1 is 961*1

[KSSV]

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

May be the above?

[Rui Mauaie]

now I got wi=960 wi=160+1:size(T1:1), the size os T1 961*1,,,,, I don't understand why the result is 960 because I'm adding 160+1:size(T1:1); may help to understand the result

[KSSV]

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]

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