How can I implement KNN ? I want to have user input and data from excel sheet compared.

Question

ML 2022-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/1718150-how-can-i-implement-knn-i-want-to-have-user-input-and-data-from-excel-sheet-compared

回答： KSSV 2022-5-13

Basically I want to have a code that compares input with excel sheet data if said data is there then I want to return that if not I'd like to find the closet value to it (nearest neighbor). It would also return the difference between the nearest neighbor and input, how could I go about it?

Ex:

Userinput-- my patient weighs 115lbs and is 33 yrs old

data -- patients in hospital x weigh (97lbs and is 15 yrs old, 140lbs and is 30yrs old, 105lbs and is 25 yrs old, 210 and is 67yrs old )

Answer: is similar to patient that weighs 105lbs and is 25 yrs old the difference between them is 8 yrs 10lbs

Any ideas are welcome, thank you! If anymore explanation is needed I would be happy to try and further explain!

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Answer 1

KSSV 2022-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/1718150-how-can-i-implement-knn-i-want-to-have-user-input-and-data-from-excel-sheet-compared#answer_963065

在 MATLAB Online 中打开

Say it loudly today that your function is knnsearch.

weight = [971; 1401; 105; 210] ; 
age = [15; 30 ; 25 ; 67]  ; 
data = table(weight,age) 
data = 4×2 table
    weight    age
    ______    ___

      971     15 
     1401     30 
      105     25 
      210     67 
% user input
input_weight = 115 ;
input_age = 33 ;
idx = knnsearch([data.weight data.age],[input_weight input_age]) ;
iwant = [data.weight(idx) data.age(idx)] 
iwant = 1×2
   105    25
thediff = abs(iwant-[input_weight input_age])
thediff = 1×2
    10     8