Understanding how is working span - matlab loess smoothing

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Jan
Jan 2017-8-8
I need to smooth time series with loess method. In matlab I need to define span which is a percentage of the total number of data points, less than or equal to 1 (it is defined like that for loess method https://www.mathworks.com/help/curvefit/smooth.html ).
Does anyone know how matlab in this case will find number of data points necessary for loess smoothing when I write to it percentage of total data points? Because that number of of data points necessary for loess smoothing need to be integer.
I tried with span 0.01 (1% of the total number of data points), in my case there are 144 data points, for 0.01 there are 0.01*144=1.44 data points for smoothing method, for 0.02 there are 0.02*144=2.88 data points for smoothing method. After smoothing with loess method and span 0.01 and 0.02 I got totally same results. I thought matlab is rounding number of data point for smoothing according to percentage, but it is not the case. I can`t understand how matlab finds number of data points for smoothing according to given percentage?

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