How to round a large array to the nearest factor of 0.0064
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Jamie England
le 8 Nov 2018
Commenté : Star Strider
le 8 Nov 2018
Hi, I have an array of data that is a 92246x1 double. The data has been retrieved from a sensor that is outputting in what appears to be steps of 0.0064V. This data has some noise present so I am wanting to round the data to the nearest interval of 0.0064V, what is the easiest way to do this? Thanks in advance
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Star Strider
le 8 Nov 2018
I am not certain what you want.
Three options:
A = rand(20,1); % Create Data
R1 = rem(A, 0.0064);
R2 = quant(A, 0.0064);
R3 = round(A/0.0064);
Q = [A, R1, R2, R3]; % Compare Results
The quant (link) function is now (in R2018b) in the Deep Learning Toolbox. I have no idea where it was in earlier releases.
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John D'Errico
le 8 Nov 2018
Modifié(e) : John D'Errico
le 8 Nov 2018
Hint:
What would happen if you divided the entire array by 0.0064?
What if you then rounded the result to the nearest integer?
Finally, multiply by 0.0064. So
y = 0.0064*round(x/0.0064);
Note that all of this is perfectly vectorized, so the size of your array is irrelevant. And finally, see that you need to be careful in the end, because the final result will not actually be a multiple of 0.0064.This because 0.0064 is not representable exactly as a double. It will be as close as possible however.
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Fangjun Jiang
le 8 Nov 2018
Modifié(e) : Fangjun Jiang
le 8 Nov 2018
x-rem(x,0.0064)
It is the floor() effect. If you want "round" effect, you might need a few lines more. This example assumes scalar input but can be vectorized.
c=0.0064;
r=rem(x,c)
if r<c/2
y=x-r;
else
y=x-r+c;
end
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