Spline and NaN
in [Matlab]
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From: Alexandra on 10 May 2010 10:45 HI, I'm trying to make a smoothing spline through N-dimensional data (with spline toolbox). Something like spaps({x,y}, f, s) Everything works fine so far. Now, I have a new set of data points where some values are NaN. Matlab (understandably) doesn't like to build a spline where NaN values are. The non-NaN values are in a self-contained area, but since x and y are only vectors, it is difficult to reshape f to any useful form without NaNs. Is there any possibility to tell the spline function to take only certain values? Or any other ideas? Thanks
From: Mark Shore on 10 May 2010 11:19 "Alexandra " <rueger(a)tum.de> wrote in message <hs966d$o89$1(a)fred.mathworks.com>... > HI, > > I'm trying to make a smoothing spline through N-dimensional data (with spline toolbox). Something like > spaps({x,y}, f, s) > Everything works fine so far. Now, I have a new set of data points where some values are NaN. Matlab (understandably) doesn't like to build a spline where NaN values are. The non-NaN values are in a self-contained area, but since x and y are only vectors, it is difficult to reshape f to any useful form without NaNs. > Is there any possibility to tell the spline function to take only certain values? Or any other ideas? > > Thanks For simple replacement, data(isnan(data))=1 (or whatever numerical value you want) should work. But look at http://www.mathworks.com/matlabcentral/fileexchange/4551 http://www.mathworks.com/matlabcentral/fileexchange/21214
From: TideMan on 10 May 2010 16:06 On May 11, 2:45 am, "Alexandra " <rue...(a)tum.de> wrote: > HI, > > I'm trying to make a smoothing spline through N-dimensional data (with spline toolbox). Something like > spaps({x,y}, f, s) > Everything works fine so far. Now, I have a new set of data points where some values are NaN. Matlab (understandably) doesn't like to build a spline where NaN values are. The non-NaN values are in a self-contained area, but since x and y are only vectors, it is difficult to reshape f to any useful form without NaNs. > Is there any possibility to tell the spline function to take only certain values? Or any other ideas? > > Thanks Why not simply remove those points from the vectors: indx=isnan(x) | isnan(y); % Look for NaNs in x or y % Remove points that have NaN in x or y x(indx)=[]; y(indx)=[];
From: Alexandra on 12 May 2010 05:04 TideMan <mulgor(a)gmail.com> wrote in message <a9e9e9b1-7fb6-45cd-bc89-91ad3f58bc56(a)v29g2000prb.googlegroups.com>... > On May 11, 2:45 am, "Alexandra " <rue...(a)tum.de> wrote: > > HI, > > > > I'm trying to make a smoothing spline through N-dimensional data (with spline toolbox). Something like > > spaps({x,y}, f, s) > > Everything works fine so far. Now, I have a new set of data points where some values are NaN. Matlab (understandably) doesn't like to build a spline where NaN values are. The non-NaN values are in a self-contained area, but since x and y are only vectors, it is difficult to reshape f to any useful form without NaNs. > > Is there any possibility to tell the spline function to take only certain values? Or any other ideas? > > > > Thanks > > Why not simply remove those points from the vectors: > indx=isnan(x) | isnan(y); % Look for NaNs in x or y > % Remove points that have NaN in x or y > x(indx)=[]; > y(indx)=[]; Problem is, f is a matrix and if I simply delete a point from my coordinates, there is a whole row of my data missing and not only those which are NaN
From: Alexandra on 12 May 2010 05:05 "Mark Shore" <mshore(a)magmageosciences.ca> wrote in message <hs985q$72r$1(a)fred.mathworks.com>... > "Alexandra " <rueger(a)tum.de> wrote in message <hs966d$o89$1(a)fred.mathworks.com>... > > HI, > > > > I'm trying to make a smoothing spline through N-dimensional data (with spline toolbox). Something like > > spaps({x,y}, f, s) > > Everything works fine so far. Now, I have a new set of data points where some values are NaN. Matlab (understandably) doesn't like to build a spline where NaN values are. The non-NaN values are in a self-contained area, but since x and y are only vectors, it is difficult to reshape f to any useful form without NaNs. > > Is there any possibility to tell the spline function to take only certain values? Or any other ideas? > > > > Thanks > > For simple replacement, data(isnan(data))=1 (or whatever numerical value you want) should work. > > But look at > http://www.mathworks.com/matlabcentral/fileexchange/4551 > http://www.mathworks.com/matlabcentral/fileexchange/21214 Thank you, inpaint_nans is exactly what I need :-)
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