if-else statement for 4 comparison
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I want to use if-else & for-loop to make comparison where outputs can be one of four options- TP,TN,FP,FN
Supposed I have two row vectors of whose elements are 1s & 0s.
A= [0;1;0;1;1;0;1];
B= [0;1;1;0;1;1;0];
for i=1:7
if A(i) ==1 && B(i)==1
output TP=1
elseif A(i) ==1 && B(i)==0
output FN=1
elseif A(i) ==0 && B(i)==0
output TN=1
else
output FP=1
end
end
I need help on how to properly code this. My idea above is not working
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更多回答（3 个）
You can do it something like this, assuming your inputs are binarized as described.
A = [0;1;0;1;1;0;1];
B = [0;1;1;0;1;1;0];
strmap = {'TN';'FN';'FP';'TP'};
output = strmap(A + 2*B + 1)
David Hill
2022-2-12
编辑：David Hill
2022-2-12
A= [0;1;0;1;1;0;1];
B= [0;1;1;0;1;1;0];
output=cell(size(A));
output(A==1&B==1)={'TP'};
output(A==1&B==0)={'FN'};
output(A==0&B==0)={'TN'};
output(A==0&B==1)={'FP'};
2 个评论
Cutie
2022-2-12
It is programmed. David's method uses logical indexing to create one cell array of character vectors which is the same size as A.
A= [0;1;0;1;1;0;1];
B= [0;1;1;0;1;1;0];
output=cell(size(A));
output(A==1&B==1)={'TP'};
output(A==1&B==0)={'FN'};
output(A==0&B==0)={'TN'};
output(A==0&B==1)={'FP'};
output % show the result
Cris LaPierre
2022-2-12
编辑：Cris LaPierre
2022-2-13
I modified your code to run it here and display the error.
You are close, but your syntax is incorrect. Assignment in MATLAB is done with the '='. For example
output = 'TN'
Also, each loop will overwrite the previous ouput value with the new one. Once finished, you will only have the result of the final loop. Use your loop index to assign the current output to a specific location in the vector output. For example
output(i) = 'TN'
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