dsearchn() Command is slowing down my algorithm, Any better Solution? MATLAB

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Shahab Khan
Shahab Khan 2018-10-26
编辑： Bruno Luong 2018-10-27
I am using the following code to calculate altitude.
Data = [Distance1',Gradient];
Result = Data(dsearchn(Data(:,1), Distance2), 2);
Altitude = -cumtrapz(Distance2, Result)/1000;
Distance 1 and Distance 2 has different size with same values so I am comparing them to get corresponding value of Gradient to use with Distance 2.
Just to execute these 3 lines the Matlab takes 12 to 15 seconds. Which slow down my whole algorithm.
Is there any better way I can perform above action without slowing down my algorithm?
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Bruno Luong
Bruno Luong 2018-10-27
编辑：Bruno Luong 2018-10-27
I wrote replace just the DSEARCH, not the rest.
If you want to get the same Result as with
Data = [Distance1',Gradient];
Result = Data(dsearchn(Data(:,1), Distance2), 2);
and Data is just temporary variable and you don' mind to trash it away after, then
Result = interp1(Distance1,Gradient,Distance2,'nearest');

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采纳的回答

Bruno Luong
Bruno Luong 2018-10-27
编辑：Bruno Luong 2018-10-27
Replace
dsearchn(Data(:,1), Distance2)
by
interp1(Distance1,Distance2,'nearest');
If you want to get the same Result as with
Data = [Distance1',Gradient];
Result = Data(dsearchn(Data(:,1), Distance2), 2);
and Data is just temporary variable and you don' mind to trash it away after, then
Result = interp1(Distance1,Gradient,Distance2,'nearest');

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