calculate means to plot

1 次查看（过去 30 天）

显示更早的评论

Kuang-Yu WANG 2018-6-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/407433-calculate-means-to-plot

评论： Kuang-Yu WANG 2018-6-26

在 MATLAB Online 中打开

i have many datas.

thething = {26*7 double} {200*7 double} {100*7 double} .... {22*7 double}.

I want to call out each mean in (:,4) to form a plot. however the matlab keep saying the means after 22th cell do not exist. This is the script i use.

>> mean(cellfun(@(x) x(:,4), thething,'UniformOutput',false))

But it could not generate anything.

7 个评论
显示 5更早的评论隐藏 5更早的评论

Walter Roberson 2018-6-26

Do not do it with cellfun: do it with a loop.

It is possible to do with cellfun, but you end up having to pad short arrays with nan and then using nanmean. I do not recommend the technique for beginners.

Kuang-Yu WANG 2018-6-26

Thanks for suggestion. But I still do not find a simple way for loop to do the task.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Walter Roberson 2018-6-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/407433-calculate-means-to-plot#answer_326297

在 MATLAB Online 中打开

cellfun(@(x) mean(x(:,4)), thething)

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

KSSV 2018-6-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/407433-calculate-means-to-plot#answer_326298

在 MATLAB Online 中打开

N = [10 8 4 5 9] ;
M = length(N) ;
A = cell(M,1) ;
% create some radom data 
for i = 1:M
    A{i} = rand(N(i)) ;
end
% get mean 
C = cellfun(@(x) mean(x(:,4), 1), A, 'UniformOutput', false);