How to change units of a value?

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np
np 2016-6-22
评论： Haziq Hakim 2021-3-11
I have data in data.speed which graphs in frames vs. pixels
I am trying to make it to show in seconds vs. cm
please help!!
it is 362 pixels in 5.7cm and 30 frames per second it is 360 seconds and 10800 frames the data is in a 10800 x 1 array

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dpb
dpb 2016-6-22
编辑：dpb 2016-6-22
Gotta' know the frame rate and image resolution...if known, pretty simple to scale the axes; if not, "no way, no how"
"362 pixels in 5.7cm and 30 frames per second"
cmPer=5.7/362; % cm/pixel conversion
secPer=1/30; % sec/frame
t=secPer*[1:360*30]; % time vector in sec for t axis
v=cmPer*data.speed; % speed in cm/sec
plot(t,v)
You don't need the temporaries simply to plot, of course, but if want to keep the normalized data...
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dpb
dpb 2021-3-2
Well, you're almost there...
interval=150/1000; % 150 msec interval
N=numel(speed); % number samples --> length of speed array
t=0:interval:(N-1)*interval; % time vector to match
Haziq Hakim
Haziq Hakim 2021-3-11
Apologies for the late reply. Thank you so much! This helped a lot :)

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