interp1 question for resampling

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Andra Topan
Andra Topan 2021-4-11
评论： Star Strider 2021-4-12
I am trying to use interp1 to resample my data. I have the values of forces for different timeframe lengths. (eg. I have 4 trials, trial one has 36 frames, trial 2 has 43, trial 3 has 38, tria4 has 35). To compare them have a nice figure, I want to <<expand>> the number of frames to 100 for each of them (like it would be 1-100% of the timeframe).
I used resample in the beginning, but I get some noise in the beginning and the end of the signal.
dif_Fx = (resample(dif(1:motion_length,1),100,motion_length))
(motion_length is the number of frames and dif is my signal)
I tried to use interp1 as
dif_Fx = (interp1((dif(1:motion_length,1)),1:1:100));
dif_Fx is just the signal (dif), and the rest of the values, from motion_length+1 to 100 are NaN.
I have read again and again the documentation, but I can;t seem to understand how to modify it to get what I want.
Any help is much appreciated.

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Star Strider
Star Strider 2021-4-11
To prevent the NaN results from being part of the interp1 output, specify an interpolation method and use the 'extrap' argument. See the function documentation for details.
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Andra Topan
Andra Topan 2021-4-12
Thank you so much! This was really helpful.
It woked with minor tweaks.

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