How to store any sensor's last 1 second's values in workspace as a vector (Real Time mode)?
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Hey
e.g.
joy = vrjoystick(1);
x = axis(joy, 1); % This just gives me current value of x-axis of the joystick
But I need a vector which gives me values of 'x' in latest 1 second.
Why I need this? Because one of my matlabscript.m demands values of 'x' in latest 1 second. Not just the current value of x-axis of the joystick.
% So i think there should be something always running in background of Matlab, which can give me recent values of 'x'%.
Thanks
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Adam Danz
2018-7-2
编辑:Adam Danz
2018-7-2
What's the sampling rate? In your plot, I assume the y axis is angular velocity while the x axis is an index of samples such that x=60 is the 60th sample. If you're sampling at 200Hz that's a sample per 5ms so x=60 is 300ms; if you're sampling at 60Hz, x=60 is 1000ms.
I assume the variable 's' is a vector whose length continually grows. Say your sampling rate is 200Hz, all you need is the last 200 samples of 's' to isolate the last 1-second of data. Within your while loop, that would be ...
sampleRate = 200 %hz
while ...
lastSecond = s(end-sampleRate+1 : end);
end
Variable 'lastSecond' will always contain the most recent (hense last) second of data. However you'll likely run into memory problems if you allow s to grow to enormous lengths.
If you're interested in collecting only the last second of data continuously and tossing any data prior to 1 second,
sampleRate = 200 %hz
s = zeros(1, sampleRate);
while ...
d = 25*axis(joy, 1);
s(1) = []; %get rid of oldest value
s(sampleRate) = d; %add newest value
end
Of course none of this is tested because I don't have a cool steering wheel interface.
3 个评论
Adam Danz
2018-7-3
If you create a timer object, which was mentioned in this thread and the thread in your link, you'll still need code that continually collects the most recent 1-second of joystick data and the code offered here should help you with that.
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