How do I find if array A is element of array B within interval?

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Nik Rocky 2020-6-7

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评论： Sriram Tadavarty 2020-6-7

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Hello,

I'm looking for possibility to get True Positive/ False Negative/ False Positive values.

For example, I have two arrays

A = [1000, 1200,1200,1700];

and

B = [0, 0, 1500, 1250, 1250, 2300, 200];

A are frequencies, B are detected frequencies-vector.

First I'm using:

A = nonzeros(unique(A));
B = nonzeros(unique(B));  

to avoid zeros and repeats and get:

A = [1000, 1200, 1700];
B = [200, 1250, 1500, 2300] ;

Now I want to look for:

if values B are elements of A +-var-Value 
    than TP = TP + 1;
if values B are not elements of A +-var-Value 
    than FP = FP + 1;
if values A are not elements of B +-var-Value 
    than FN = FN + 1;
end

when var-Value = 100;

There are 3 frequencies 1000, 1200, 1700

4 frequencies are detected 200, 1250, 1500, 2300

1200 is detected (1250 - of course of var-Value interval) -> True Positive = 1

1000 and 1700 was not detected -> False Negative = 2

200, 1500 and 2300 was wrong detected -> False Positive = 3

I find an ismember(A,B) function, but there are no interval option for +-var-Value possible

So I can use a for-loops to check it, but there are maybe better solution possible?

Thank you!

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Nik Rocky 2020-6-7

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Yes, thank you, i found it allready =)

Here is my code:

Analyse1 = ismembertol(frequency_detected, frequency_actual, tube_var, 'DataScale' , 1)
Analyse2 = ismembertol(frequency_actual, frequency_detected, tube_var, 'DataScale' , 1)
TP_help = nnz(Analyse1); %right frequency detected 
FP_help = nnz(~Analyse1); %wrong frequency detected 
FN_help = nnz(~Analyse2); %no frequency detected