# Find lower query points compared to the Reference vector

2 vues (au cours des 30 derniers jours)
Ganesh Naik le 6 Août 2022
Commenté : Ganesh Naik le 8 Août 2022
Hi all, I have two vectors, one is "Beg_Data" which has 19 values and I have another reference vector "Beg_In_Ex" which contains 1239 values (Data attached). I am computing a new vector "End_Cycle" same size (19 values) that of "Beg_Data" vector based on the nearest neighbour search. I would like to achieve the results of "End_Cycle" values lower than that of corresponding values that of "Beg_Data". However, using the method that I have attempted I found some values are always higher than that of the "Beg_Data" values. As you can see I want the difference to be always positive (End_Cycle<Beg_Data). Any help in this regard is highly appreciated.
End_Cycle = dsearchn(Beg_In_Ex',Beg_Data);
End_Cycle = Beg_In_Ex(End_Cycle)';
Start_Stop = [End_Cycle Beg_Data]
Start_Stop = 19×2
1.0e+06 * 0.0746 0.0761 0.2064 0.2047 0.2327 0.2346 0.4144 0.4130 0.5276 0.5263 0.6324 0.6329 0.8096 0.8088 0.9534 0.9518 0.9722 0.9702 0.9777 0.9760
Difference = Start_Stop(:,2)-Start_Stop(:,1)
Difference = 19×1
1.0e+03 * 1.4242 -1.6832 1.9540 -1.3347 -1.3141 0.4402 -0.7642 -1.6077 -2.0212 -1.6784
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Voss le 7 Août 2022
Just change the definition of idx(ii):
idx(ii) = find(Beg_In_Ex >= Beg_Data(ii),1);
Ganesh Naik le 8 Août 2022
Dear Voss, thanks, this is perfect and it works.
Kind regards

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### Réponse acceptée

Voss le 6 Août 2022
idx = zeros(size(Beg_Data));
for ii = 1:numel(Beg_Data)
idx(ii) = find(Beg_In_Ex <= Beg_Data(ii),1,'last');
end
End_Cycle = Beg_In_Ex(idx).';
Start_Stop = [End_Cycle Beg_Data]
Start_Stop = 19×2
1.0e+06 * 0.0746 0.0761 0.2016 0.2047 0.2327 0.2346 0.4108 0.4130 0.5245 0.5263 0.6324 0.6329 0.8071 0.8088 0.9495 0.9518 0.9676 0.9702 0.9732 0.9760
Difference = Start_Stop(:,2)-Start_Stop(:,1)
Difference = 19×1
1.0e+03 * 1.4242 3.0948 1.9540 2.2663 1.7939 0.4402 1.6808 2.2943 2.5998 2.8346
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