MATLAB CODE FOR ROOT MEAN SQUARED
显示 更早的评论
Hello,please I have a matrix M, containng three distinct sets of data, and I intend to calculate the root mean squared. Coiuld some kinndly assist me; here is my trial code
clear all;close all;clc
A=[2 4 7 10 28]; %first
B=[1 3.6 8 11 27];%seccond
C=[0.5 5 9.5 13 32];%third
M=[A' B' C'];
[rows, columns] = size(M);
MEAN=zeros(rows, columns);
for row = 1 : rows
MEAN(row) = mean(M(row, :));
cal_rms=sqrt((MEAN-M(row, :)).^2./columns);
end
plot(cal_rms);
采纳的回答
Torsten
2022-9-13
This is not the standard definition for the root-mean-square value of a matrix.
Are you sure about the formula ? Then use
cal_rms(row) = sqrt((MEAN-M(row, :)).^2./columns);
instead of
cal_rms=sqrt((MEAN-M(row, :)).^2./columns);
2 个评论
Grace
2022-9-13
MATLAB has a function "rms" for the rooot-mean-square value - you might want to use it, but it doesn't work with the matrix elements shifted by the mean value.
What you calculate is some kind of standard deviation of the rows of M, but in this case, you had to divide by (columns-1), not by (columns).
A=[2 4 7 10 28]; %first
B=[1 3.6 8 11 27];%seccond
C=[0.5 5 9.5 13 32];%third
M=[A.', B.', C.'];
[rows, columns] = size(M);
MEAN=zeros(rows,1);
for row = 1 : rows
MEAN(row) = mean(M(row, :));
cal_rms(row) = sqrt(sum((MEAN(row)-M(row,:)).^2)/columns);
end
plot(cal_rms)
更多回答（1 个）
To my book the mean should not be removed in calculation of RMS
M = rand(3,100);
[rows, columns] = size(M);
cal_rms = zeros(rows,1);
for row=1:size(M,1)
cal_rms(row) = sqrt( sum(M(row, :).^2) / columns );
end
cal_rms % theoretical value is sqrt(1/3) for rand()
类别
在 帮助中心 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息
Translated by 
