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

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Sarah Preuß 2021-12-1

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评论： Sarah Preuß 2022-1-17

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. :)

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Answer 1

Matt J 2021-12-1

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编辑：Matt J 2021-12-1

在 MATLAB Online 中打开

INTERP1 would be sufficient here.

depthFehmarn=unique(depthFehmarn);
xq=linspace( depthFehmarn(1)  ,  depthFehmarn(end)  , newpoints);
FehmarnWT_interpl = interp1(depthFehmarn, FehmarnWT_no10, xq);

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Sarah Preuß 2022-1-17

Hello, thanks for your answer.

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

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Answer 2

Matt J 2021-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/1600434-how-can-i-produce-new-coordinates-for-one-dimension-if-a-matrix-and-interpolate-to-these-new-coordi#answer_845174

编辑：Matt J 2021-12-1

在 MATLAB Online 中打开

depthFehmarn=unique(depthFehmarn);
xq=linspace( depthFehmarn(1)  ,  depthFehmarn(end)  , newpoints);
  F=griddedInterpolant({depthFehmarn,1:6},FehmarnWT_no10);
FehmarnWT_interpl = F({xq,1:6});