interpolation of a structure array

2022 11 28
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更新时间：2022 11 29
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Hello, I have a structure array which consists of 39 variables (LFHD, RFHD, etc.) Each of those variables contains 3 double arrays of size 1 x ?. I would like to interpolate those double arrays from 1 x ? to 1 x 101 (0-100%) so that they are all the same length and I can average across them.
I am a bit of a MATLAB novice. Any assistance would be greatly appreciated.

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Matt J
Matt J 2022-11-28

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fcn=@(f)interp1(f, linspace(1,numel(f),101) );
for i=1:numel(TrajXLstance)
TrajXLstance(i) = structfun(fcn, TrajXLstance(i),'uni',0);
end

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Josh Tome
Josh Tome 2022-11-28
This is great! Thank you. Can I ask what the "f" represents?
Josh Tome
Josh Tome 2022-11-28
Sorry for the 2nd question before you answer the 1st, but I have another structure array similar to the OP, but instead of 1 x ? double arrays it has 3 x ? double arrays. When I try the same code, instead of interpolating the ? number, it interpolates the 3, so I end up with double arrays of size 101 x ?. Any thoughts?
Matt J
Matt J 2022-11-28
Can I ask what the "f" represents?
It represents the value of a struct field.
When I try the same code, instead of interpolating the ? number, it interpolates the 3
Transpose:
fcn=@(f)interp1(f.', linspace(1,numel(f),101) ).';
Josh Tome
Josh Tome 2022-11-28
when I use the transpose on the 3 x ? double arrays at first glance it appeared to work by creating arrays of 3 x 101. However, looking closely at these arrays it compressed the actual data by half, and then filled the rest of the 101 points with NAN's. For instance a 3 x 66 array of data was converted into a 3 x 33 array of data with the last 3 x 68 array of NANs. Any idea why that would happen?
Matt J
Matt J 2022-11-29
Try this insead,
fcn=@(f)interp1(f.', linspace(1, size(f,2) ,101) ).';
Josh Tome
Josh Tome 2022-11-29
Yes, that seems to work. Thanks again for your help!

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