Average the every 40 rows from csv file until finish and save the data in new csv files

Hi,

I am completely stuck here and do not know how to proceed. Basically, I am reading the sensor data from the excel which have a 40 repetition every second. I want to take a average of 40 repetition and save into separate file, data is for like 20 mins. Below is the code I am trying but can't think from an hour how to proceed further.

a = readmatrix('firsttest_2_try.csv');

x = a (:,1);

y = a (:,3);

counter = 0

for i = 1 : length(x)

counter = counter+i;

end

any help would be great

Answer 1

[Star Strider]

I have no idea what you want to do.

If you want to take the mean of the 1 second blocks (and you have the Signal Ptocessing Toolbox), use the buffer function separately on ‘x’ and ‘y’., then take the mean of the resulting matrix across dimension #1 (columns).

Calculate the number of samples as:

NrSamples = Fs*sec;

where ‘Fs’ is the sampling frequency and ‘sec’ is the number of seconds.

If you want to take the mean using a window of that length, use the movmean function.

.

[Star Strider]

muhammad choudhry’s Answer became this Comment —

I just want to take the average of rows in the excel file by 40 until the number of rows finish and save into df file.

[Star Strider]

Use the buffer function. If you so not have the Signal Processing Toolbox, use this simple emulation of it —

x = randi(9, 1, 11);
r = 4;
Q1 = buffer(x,r)                        % Original

Q1 = 4×3

3 1 2 4 4 9 7 1 3 9 9 0

Q2 = bufr(x,r)                          % Emulation

Q2 = 4×3

3 1 2 4 4 9 7 1 3 9 9 0

function M = bufr(s,r)
%   s = Signal Vector
%   r = Desired number of rows
M = zeros(r,ceil(numel(s)/r));
M(1:numel(s)) = s;
end

.