Fitting a model to a displacement field

Hi!

I have aquired a displacement field from image analysis and i want to fit a model to the field in order to be able to derive the strain.

I tried to interpolate between the points to find a function that fits but the results are not good.

The attached file contains the coordinates of the feature before (column 1 and 2) and the coordinates of the same feature after (column 3 and 4) so that for example row 1 contains the x and y coordinates of the feature before and after.

Any suggestions on where to start would be greatly appriciated.

Regards,

[Andreas Apostolatos]

Hello,

Your data in file 'Coordinates before and after .csv' contain NaNs, these values cannot be used for the interpolation. Therefore, the NaN values would first need to be removed from your dataset.

You provided a list of the X-Y coordinates before and after the deformation at particular locations. Do these coordinates correspond to an 1D or to a 2D body? If they correspond to a 2D body, then are the data scattered or gridded? This knowledge is necessary in order to use the right MATLAB function for your needs.

Kind Regards,

Andreas

[Holmbrero]

Hi!

Sorry for the NaNs, i remove all rows containing NaNs after i load the file into the script. I'll upload a new file shortly.

The data corresponds to a 2D body and is scattered.

Regards,

Anders

[Holmbrero]

The new file is uploaded.