interpolation for a matrix per row

Hi,

I have a 50x91 double in a structure for which I would like to interpolate each row and save as a 50 x 101.

My script works fine if I specify a specific row to interpolate, however I cannot solve to interpolate for each row.

My code is:

% Normalising walks to 101 data points
for j = 1:size(procfiles,1);
   n1=size(RESULTS.Kinematics(j).data,2); %number of samples per walk
   t0=linspace(1,n1,n1); %original time vector
   t1=linspace(1,n1,101); %new time vector of 101 points
   RESULTS.Kinematics(j).Resampled = interp1(t0,(RESULTS.Kinematics.data),t1,'linear');
end

Many thanks in advance.

Best wishes,

Answer 1

[Stephen23]

You forgot the indexing here:

interp1(t0,(RESULTS.Kinematics(j).data),t1,'linear')

% ^^^ missing

[Jake Bowd]

Hi Stephen,

When I do that I get the following error message:

Error using interp1>reshapeAndSortXandV (line 426)

LENGTH(X) and SIZE(V,1) must be the same.

Error in interp1 (line 93)

[X,V,orig_size_v] = reshapeAndSortXandV(varargin{1},varargin{2});

Error in Kinematics_Extraction (line 30)

RESULTS.Kinematics(j).Resampled = interp1(t0(RESULTS.Kinematics(j).data),t1,'linear');

[Stephen23]

Your code:

interp1(t0(RESULTS.Kinematics(j).data),t1,'linear');
%       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ why are you now indexing into t0 ?

Try this instead:

interp1(t0,RESULTS.Kinematics(j).data,t1,'linear');

[Jake Bowd]

Hi Stephen,

Thank you so much. I now have a working code doing what I need it too :).

Best wishes,