How can I produce new coordinates for one dimension if a matrix and interpolate to these new coordinates?

Hello,

I have a 1824x6 matrix and I want to produce new coordinates for the row dimension, which stands for the depth, in order to get a smoother contour plot. I don't want to change the column dimension, because it stands for the times when the measurements where taken.

I used meshgrid to produce new coordinates:

newpoints = 100;
[xq,yq] = meshgrid(...
            linspace(min(min(depthFehmarn,[],1)),max(max(depthFehmarn,[],1)),newpoints )...
          );

Now I wanted to interpolated with following code:

FehmarnWT_interpl = interp2(depthFehmarn,dateFehmarn,FehmarnWT_no10,xq,dateFehmarn,'linear');

I get this error message: Query coordinates input arrays must have the same size.

But I don't want new coordinates for the column dimension and now I don't know how to solve this dilemma.

I use R2020b.

Thanks in advance for your help. :)

Answer 1

[Matt J]

INTERP1 would be sufficient here.

depthFehmarn=unique(depthFehmarn);
xq=linspace( depthFehmarn(1)  ,  depthFehmarn(end)  , newpoints);

FehmarnWT_interpl = interp1(depthFehmarn, FehmarnWT_no10, xq);

[Sarah Preuß]

Hello, thanks for your answer.

I had to do a small change and then it worked fine.

Answer 2

[Matt J]

depthFehmarn=unique(depthFehmarn);

xq=linspace( depthFehmarn(1)  ,  depthFehmarn(end)  , newpoints);

  F=griddedInterpolant({depthFehmarn,1:6},FehmarnWT_no10);

FehmarnWT_interpl = F({xq,1:6});