How can I do the average between many vector columns?

2014 4 16
2 个回答
回答已采纳
更新时间：2023 11 7
5 次查看（30 天）

0 个投票

I have 120 1x500 vector columns, so I can't do it manually. For example, I have the following vector columns, each 1x500 in size:
a1, a2, ......, an, where n=120
I want to do:
(a1 + a2 + ... + an)/n
Thank you very much!
Adrian

请先登录，再回答此问题。

 采纳的回答

José-Luis
José-Luis 2014-4-16
编辑：José-Luis 2014-4-16

1 个投票

%Creating vectors:
for ii = 1:50
str = ['a' num2str(ii)];
assignin('base',str,rand(100,1));
end
%Preallocating:
your_mat = ones(100,50);
%Putting everything together, this is the part you want if you already have the vectors
for ii = 1:50
str = ['a' num2str(ii)];
your_mat(:,ii) = evalin('base',str);
end
your_val = mean(your_mat(:));
Please accept an answer if it helps you.

2 个评论
显示 无 隐藏 无

Adrian
Adrian 2014-4-17
Thank you for your answer. But the thing is that it gives me just a number, because that's what 'mean' function does, it gives a single number. When I average my 120 500x1 column vectors, namely (a1 + a2 + ... + an)/n, where n=120, it should give me a 500x1 vector column, not a single number.
If you could help further, that would be great! Thanks
lvn
lvn 2014-4-17
Replace the last line of Jose-Luis code with
your_val = mean(your_mat);
Then you will have what you want. However, much better would be to initially read in/or store your data in a matrix, rather than in separate vectors, then you can simply use what Azzi wrote.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Annotations 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by