Average of array element at defined interval

Suppose,

a=[1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5]

i want to calculate average of group of five nos. so that my resulting array is like

avg=[3 3 3 3]

Can any one help me for the same.

[Adam]

What does four-four nos. mean? Judging from your example I assume you want the average of groups of 5 numbers. Or do you want 4 averages, irrespective of how many elements fall into the four subsections of your array (whose length may not be divisible by 4)

[Nikhil Chourasia]

Sorry Adam i have written four-four by mistake. I have now edited my question

Answer 1

[Star Strider]

Use the rehaspe function, then mean, since it takes the means of columns as its default behaviour:

a=[1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5];
ar = reshape(a, [], 4)
ar_mean = mean(ar)

produces:

ar =

       1     1     1     1
       2     2     2     2
       3     3     3     3
       4     4     4     4
       5     5     5     5

ar_mean =

       3     3     3     3

[Nikhil Chourasia]

Thanks Star Strider for your help

[Star Strider]

My pleasure!

[Stelios Fanourakis]

I think this is what I need. But why I get NaN values when I am using this line

AxesH = set(gca,'XTick',(0.099:1:37.9))
 
e = double(AxesH)
 
ar = reshape(e, [], 2)
ar_mean = mean(ar)

[Star Strider]

Look at ‘AxesH’. It may be empty,or have no numeric values.

Answer 2

[prem matlani]

High,

I have collected data from a source and it clearly shows that there has been some tests at specific points in the x axis (1100, 900, 650, 420, 200) approx, how can i filter this data to get rid of the noise within the ranges