How can I subtract 2 2D graphs made by vectors of different length?

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Ricardo Fuertes
Ricardo Fuertes 2018-6-6
评论： Ricardo Fuertes 2018-6-6
I have 2 sets of data from the same experiment recorded with different methods. The results are 2 graphs describing the same but with some differences. To find those differences I want to subtract the graphs so that I can have a visual representation of where the differences are located.
The problem I have is that the first method has a "X resolution" of 10 data points per second, but the second method's resolution is not constant, sometimes its 7, sometimes its 15. Because of this I can’t just subtract the arrays, since they are not the same length.
Is there a way to do this?

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采纳的回答

Image Analyst
Image Analyst 2018-6-6
Yes, just use interp1() to interpolate them to a common time sequence. If you can't figure it out, attach your two vectors in a .mat file, say what you want the new sampling spacing to be, and someone will do it for you.
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Ricardo Fuertes
Ricardo Fuertes 2018-6-6
Thanks! Its works. I had to remove some data points with the same X value, otherwise I would get 'The grid vectors must contain unique points.' error.

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更多回答（1 个）

Alfonso
Alfonso 2018-6-6
If you want to quantify the "difference" between 2 datasets of different length, say dataset A with length 100 and dataset B with length 150, you can interpolate the x and y coordinates of dataset A using the "interp1" function to 150 points (length B), then you could for example, calculate the RMSE between the 2 datasets to quantify the differences. (This is one of the ways you could do it)
interp1 function - https://es.mathworks.com/help/matlab/ref/interp1.html

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