for loop in for loop not storing all variables
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Dameon Solestro
le 22 Nov 2021
Commenté : Walter Roberson
le 24 Nov 2021
In the simplest way, I am trying to get 3 random (x,y) data sets per group with a total of 5 groups. (So 15 x coordinates and 15 y coordinates in total). Every time I use my mean(x) to find the average x. My for loop only calculates the mean for my groups of x coordinates. How do i do it for all 15 x coordinates?
for j=1:5
for i=1:3
x(i)= rand();
y(i)= rand();
hold on
end
hold on
h=mean(x)
end
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Walter Roberson
le 23 Nov 2021
for j=1:5
for i=1:3
x(i,j)= rand();
y(i,j)= rand();
hold on
end
hold on
h(j)=mean(x(:,j))
end
mean(x,1)
mean(x,2)
You can see that if you stored all of the values, that mean(x,1) calculates the same thing as taking the mean of each column at the time you generate the column.
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Dameon Solestro
le 24 Nov 2021
1 commentaire
Walter Roberson
le 24 Nov 2021
In the code I posted in https://www.mathworks.com/matlabcentral/answers/1593204-for-loop-in-for-loop-not-storing-all-variables#answer_837899 then you would just use
x - mean(h)
Note that each element of your h is a mean of a column, so mean(h) would be mean of the means
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