Aquire random sampling of plot values
7 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Baily Thomas am 22 Jul. 2020
Kommentiert: Sindar am 27 Jul. 2020
I have two plots. These two plots follow the same trend but are slighly variable. The X axis denotes time for this graph. I would like to determine the minimum amount of time (number of points along the x axis) in which the %difference between the two plots is below a certain value. I would like this to be repeatable along any point along the graphs.
My thoughts are to randomly select a certain amount of points along the x axis (number of points selected determines the amount of time that is being tested (ex: 100 points = 1 second) and then check the percent difference. Then repeat that process until statistically the %difference is accturate for the plot.
Does anyone have any idea of how to randomly sample points on two graphs along the x axis, determine the percent differnce for those two points, and then average all of that together to determine the total % differnce?
I apologize if the wording is confusion and appreciate any input! thanks!
Sindar am 22 Jul. 2020
Assuming your two datasets share x values and are not absurdly massive, this direct method is probably faster
% generate some sample data
x = 1:100;
y1 = rand(1,100);
y2 = rand(1,100);
% set a threshold of 5%
p_thresh = 0.05;
% calculate the percent difference between sets for each point
y_pdiff = y1./y2-1;
% calculate the cumulative mean
y_pdiff_mean = movmean(y_pdiff, [length(y_pdiff)-1 0]);
% find the first time the cumulative mean is less than your threshold
idx = find(y_pdiff_mean<p_thresh,1,'first');
% find the x-location corresponding to this point
x_thresh = x(idx);
Sindar am 27 Jul. 2020
I'm a bit confused. Why would a larger section necessarily have a lower % difference?
(I assumed you had two signals that eventually converged)
Find more on Surface and Mesh Plots in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!