concat/horzcat for cell with data cells of abc sizes

Question

Ankitkumar Patel 2022-5-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1730870-concat-horzcat-for-cell-with-data-cells-of-a-b-c-sizes

编辑： Jan 2022-6-1

Read variables from files

ncvars={'a','b'}; % variables need from files ncvar{1}=a, ncvars{2}=b
prjdir=[datadir 'mentioned path']; % path to directory
dinfo=dir(fullfile(prjdir,'*.nc')); %taking all files with extension .nc
num_files=length(dinfo); % number of files
E1=cell(num_files,1); % defining cell
E2=cell(num_files,1);
% taking a and b from files and putting in E1 and E2 respectively
for K = 1:num_files
    file=filenames{K};
    E1{K}=ncread(file, ncvars{1});
    E2{K}=ncread(file,ncvars{2});
end

Now the question is I want to join/concat/horzcat E1 and E2.

Where I have E1 and E2 of 2*1 cell. (2 is number of files)

When I had E1{1}=180*161 double and E1{2}= 180*146. I used folowing to horzcat:

Etemp=horzcat(E1{:},E2{:}); %Etemp is 180*614 where 614 because 2*(161+146)
E=Etemp(1:end) % E dimention 1*110520 double

Now I have E1{1}=180*161*253 double and E1{2}=180*146*127 double. Same for E2 too.

How can I use horzcat for E1 and E2 in this case??

So that I can have Etemp dimention someting like 180*100008 where because 2*(161*253+146*127)???

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。

请先登录，再回答此问题。

Answer 1

Jan 2022-5-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1730870-concat-horzcat-for-cell-with-data-cells-of-a-b-c-sizes#answer_975070

在 MATLAB Online 中打开

E1m = reshape(E1, 180, []);
E2m = reshape(E2, 180, []);
E   = cat(2, E1m, E2m);

cat(2, ...) is the same as horzcat().

2 个评论
显示无隐藏无

Ankitkumar Patel 2022-5-31

编辑：Ankitkumar Patel 2022-5-31

在 MATLAB Online 中打开

It is usefull some what. These gave divisible error.

Here E1 and E2 are 2*1 cell. So with some changes in these lines I able to create for E1 and E2 separately

E1m=reshape(E1{1},180,[]); % 180*40733
E11m=reshape(E1{2},180,[]); %180*18542
E1 =cat(2,E1m,E11m); %180*59275

Same way will get E2 and then after cat for E1 and E2 final result will be achived.

Is there any way where we can create loop for these??

Jan 2022-6-1

编辑：Jan 2022-6-1

在 MATLAB Online 中打开

Yes.

C = cell(1, 2);
for k = 1:2
    C{k} = reshape(E1{k}, 180, []);
end
E1M = cat(2, C{:});

A compact (but not faster) solution:

C = cellfun(@(x) reshape(x, 180, []), E1, 'UniformOutput', 0);
E1M = cat(2, C{:});

I use a new name instead of re-using E1. Letting a variable change its type from cell to double impedes the JIT acceleration. It is not a bug, but faster to avoid this.

请先登录，再进行评论。