Help using interp1 to resample data

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Nathan
Nathan 2014-10-9
回答： Star Strider 2014-10-9
Hi,
I have a series of data that spans 202 points. I want to resample it down to 172 points. Im using the interp1 function as:
data2(:,1) = interp1( [1:1:202] , data(:,1), [1:1:172] ,'spline') ;
But when I do this, data2 just returns the first 172 values of data. How do i actually get it to resample the entire data series to 172 points.
Thanks

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Star Strider
Star Strider 2014-10-9
I am not certain what you want to do, but this may work:
data = [1:202]'; % Create Data
xi = linspace(1,202,172); % Interpolation Vector
data2(:,1) = interp1( [1:1:202] , data(:,1), xi ,'spline') ;

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