Mean of mutiple variables
1 visualización (últimos 30 días)
Mostrar comentarios más antiguos
ali akbar
el 11 de Dic. de 2020
Comentada: dpb
el 11 de Dic. de 2020
I have 5 '.mat' data files where each datafile contains 1 by 19 cell (each cell size = 512 by 9). I wanted to find the mean of the 4th column of 1st cell from all 5 data files.
Here is a look at the code.
load('data1a.mat');load('data2.mat');load('data3.mat');load('data4.mat');load('data5.mat');...
% Extracting the 4th column
a=data1a{1,1}(:,4);b=data2{1,1}(:,4) and so on...
m=(a+b+c+d+e)/5
Now people in stoneage might used to do this kind of laborious exercise. I am wondering if anyone could give a one/two liner answer for finding mean which is not naive like mine.
4 comentarios
Stephen23
el 11 de Dic. de 2020
Copy and pasting code like this is a sign that you are doing something wrong:
load('data1a.mat');load('data2.mat');load('data3.mat');load('data4.mat');load('data5.mat');...
Learn to use arrays and indexing! For example:
Respuesta aceptada
dpb
el 11 de Dic. de 2020
Editada: dpb
el 11 de Dic. de 2020
d=dir('data*.mat'); % or similar list. Name files so can use appropriate wildcard expression
total=0;
for i=1:numel(d)
data=load d(i).name;
total=total+structfun(@(x)sum(x{1}(:,4)),data);
end
mn=mean(total);
Above does the summation; same result if were to use mean in the anonymous function as well if same number elements in each cell array.
If the variables were named consistently would be easier to code; above handles whatever they are inside the .mat files as long as just one variable per file.
2 comentarios
dpb
el 11 de Dic. de 2020
so, debug it. (Exercise for Student :) )
Accidentally wrote it as command syntax instead of function form needed.
Más respuestas (0)
Ver también
Categorías
Más información sobre Logical en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!