Dataset comparison with different sample rate and start/stop times

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Kerem Asaf Tecirlioglu 2022-8-1

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https://ww2.mathworks.cn/matlabcentral/answers/1772175-dataset-comparison-with-different-sample-rate-and-start-stop-times

编辑： Kerem Asaf Tecirlioglu 2022-8-1

Hello,

I have two devices in my hand. One is the encoder and other one is the IMU. The IMU attached to the encoder and then both are rotated simultaneously. I gather data from both devices with generic timestamps (GMT+3) import into the matlab using 'datenum' and 'xlsread' functions.

Here is the plot I get,

I need the differences in between to measure a mean error where the encoder data is the reference. But two vectors are not in same length due to the different sampling rates of devices. I tried many options; DSP tools , interp1, interpolation etc. Can you help me with this simple problem ?

NOTE: It is not really have be in the MATLAB environment. But I believe MATLAB is capable of doing such things ( Maybe not the easiest solution; easiest solution I prefer)

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Benjamin Thompson 2022-8-1

Can you post sample data and work you have done so far?

Kerem Asaf Tecirlioglu 2022-8-1

编辑：Kerem Asaf Tecirlioglu 2022-8-1

在 MATLAB Online 中打开

Thanks for the answer

Here is the code to import datasets,

[enc_val ,enc_time] = xlsread("ecnoder_quasi_2.xlsx");
[imu_val ,imu_time] = xlsread("sd_quasi_2.xlsx");
enc_time = datenum(enc_time,'hh:MM:ss.fff');
imu_time = datenum(imu_time,'hh:MM:ss.fff');
figure; plot(imu_time,imu_val,'Color','blue'); hold on; plot(enc_time,enc_val,'Color','red'); hold off;