Smoothing data without span
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By how many samples will the data be smoothed if no span is used?
回答（1 个）
Hi Aylin,
The span determines the number of data points used to compute the smoothed value. It can be specified as either an integer or a scalar that represents the fraction of the data to be used in a span.
If no span value is provided, the function defaults to using a maximum of 5 elements for averaging.
Here's a simple example to demonstrate how it works:
a=[3 8 2 1 5 5];
b=smooth(a);
disp(b);
When you apply'b = smooth(a);', the output is calculated as follows:
b(1) = a(1)
b(2) = (a(1) + a(2) + a(3))/3
b(3) = (a(1) + a(2) + a(3) + a(4) + a(5))/5
b(4) = (a(2) + a(3) + a(4) + a(5) + a(6))/5
b(5) = (a(4) + a(5) + a(6))/3
b(6) = a(6)
For more information, please refer to the MATLAB documentation linked below.https://www.mathworks.com/help/curvefit/smooth.html
Hope it resolves your query.
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2021-2-12
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