Smoothing data without span

By how many samples will the data be smoothed if no span is used?

Answer 1

[Abhaya]

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); 

    3.0000
    4.3333
    3.8000
    4.2000
    3.6667
    5.0000

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.