- Load each MAT file one by one.
- Calculate the RMS and Crest Factor and store the values in arrays.
- Then, plot the RMS values and Crest Factors in separate subplots within a single figure.
How to calculate RMS and Crest Factor of separate data and combine into one file and one plot
5 views (last 30 days)
Show older comments
Hello,
In case that I have the separate 123 mat files (bearing1_1_1.mat to bearing 1_1_123.mat) and I would like to calculate RMS and Crest Factor of each data and plot into the graph like an attached picture (RMS of data 1 to data 123), how should I write the script?
Thanks for your kind supports
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/910125/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/910130/image.png)
0 Comments
Answers (1)
Sudarsanan A K
on 4 Nov 2023
Hi Pasu,
I understand that you are looking for a MATLAB script that would enable you to find and plot the Root Mean Square (RMS) and Crest Factor from a collection MAT files.
You can achieve this as follows:
Here is an example code:
%% I am creating some MAT files that store random data (for the purpose of complete demonstration)
numFiles = 123; % Total number of data files
for i = 1:numFiles
% Generate random data
data = rand(1, 1000); % Change the size of the data as per your requirement
% Save data to mat file
fileName = sprintf('bearing1_1_%d.mat', i);
yourDataVariable = data; % Assign the data to the variable name
save(fileName, 'yourDataVariable');
end
%% Here is the structure of MATLAB script you are looking for
% Initialize variables
numFiles = 123; % Total number of data files
rmsValues = zeros(1, numFiles);
crestFactors = zeros(1, numFiles);
% Loop through each data file
for i = 1:numFiles
% Load the data file
fileName = sprintf('bearing1_1_%d.mat', i);
data = load(fileName);
% Calculate RMS
rmsValues(i) = rms(data.yourDataVariable); % Replace 'yourDataVariable' with the actual variable name in your mat file
% Calculate Crest Factor
crestFactors(i) = max(abs(data.yourDataVariable)) / rmsValues(i);
end
% Plot RMS and Crest Factor
figure;
subplot(2, 1, 1);
plot(rmsValues);
title('RMS');
xlabel('Data File');
ylabel('RMS Value');
subplot(2, 1, 2);
plot(crestFactors);
title('Crest Factor');
xlabel('Data File');
ylabel('Crest Factor');
You can additionally refer the MathWorks documentation for better understanding of the "sprintf()" function that I have used in the example:
I hope this helps you resolve the issue.
0 Comments
See Also
Categories
Find more on Annotations in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!