I am attempting to calculate continuous relative phase (CRP) using the equation: CRP(i) = atan (velocity(i)/displacement(i)). How ever when I run my code the plots do not appear to produce the correct results. From the raw plots of my original data the subject is clearly in anti-phase but according to the CRP plot the subject is basically at 0 degrees, in phase, for the entire test period.
I'm fairly certain that it is something basic in my equation but i have checked it several times and cannot seem to figure out what it is.
The code is below, Ignore the first section I just convert the data I have into degrees:
time = data(:,1);
signal_comp = data(:,2);
signal_subj = data(:,3);
"Alan Armstrong" <firstname.lastname@example.org> wrote in message <email@example.com>...
> I am attempting to calculate continuous relative phase (CRP) using the equation: CRP(i) = atan (velocity(i)/displacement(i)). How ever when I run my code the plots do not appear to produce the correct results. From the raw plots of my original data the subject is clearly in anti-phase but according to the CRP plot the subject is basically at 0 degrees, in phase, for the entire test period.
> I'm fairly certain that it is something basic in my equation but i have checked it several times and cannot seem to figure out what it is.
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The 'atan' function returns an angle in radians, not degrees, and they range only from -pi/2 to +pi/2. If you want angles that have a full circle range from -pi to +pi, you should use the 'atan2' function. If you want degrees, multiply these outputs by 180/pi.
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