Calculating the Standard Deviation
5 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi,
How to read each value from a txt file for calculation of standar deviation (SD).
For example, I have my txt file with Y values (frequencies) and I want to caulate how much of variation from the mean the frequencies change. I can do it manually but for many data this would be too slow process. So, I want to automatically read and calculate the SD.
My file has jus one colum. To calculate the SD I have to calculate mean first, so would be: Mean = A/n
The variable A would be the sum of each value in my file divivded by the total number of values. Attached is the file. Then, I can calculate the SD which is
the sqr((A(1)-Mean)^2 + (A(2)-Mean)^2 + ... + (A(N)-Mean)^2/n-1).
Is there a way to do it automatic?
Thank you
2 commentaires
Réponse acceptée
Star Strider
le 5 Mai 2021
y = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/608245/y%20axis.txt')
ymean = mean(y)
stdvct = sqrt((y-ymean).^2)
[N,C,S] = normalize(y,'center','mean')
5 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Loops and Conditional Statements dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!