Looping through every column and saving output?

Question

Robert 2015-5-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/218021-looping-through-every-column-and-saving-output

评论： Pavel Montes de Oca 2019-8-29

I have a 96x1505 matrix. I want to run an analysis on each column then have the output for each iteration saved in a separate .txt file (creating 1505 text files). The code that needs to be looped is as follows, where x is a column of data

[c,l] = wavedec(x,6,'dmey');
cA3 = appcoef(c,l,'dmey',6);
[cD1,cD2,cD3,cD4,cD5,cD6] = detcoef(c,l,[1,2,3,4,5,6]);
D6 = wrcoef('d',c,l,'dmey',6); 
D5 = wrcoef('d',c,l,'dmey',5);
D4 = wrcoef('d',c,l,'dmey',4);
D3 = wrcoef('d',c,l,'dmey',3);
D2 = wrcoef('d',c,l,'dmey',2);
D1 = wrcoef('d',c,l,'dmey',1);

So each new text file should have 6 columns in it, D1-D6.

Any help would be greatly appreciated.

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

Stephen23 2015-5-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/218021-looping-through-every-column-and-saving-output#answer_180041

编辑：Stephen23 2015-5-22

在 MATLAB Online 中打开

The answer really depends on many things that you have not told us: the number type (integer / float), the required file format, the desired precision, column alignment, etc. There are different functions for saving data to text files, and each of them has different options and output file formats:

http://www.mathworks.com/help/matlab/text-files.html

For a start you can use a simple for loop, and csvwrite to save the data, something a bit like this (untested code):

ncol = size(matrix,2);
for k = 1:ncol
    ... code here
    D = [];
    D(:,6) = wrcoef('d',c,l,'dmey',6);
    D(:,5) = wrcoef('d',c,l,'dmey',5);
    D(:,4) = wrcoef('d',c,l,'dmey',4);
    D(:,3) = wrcoef('d',c,l,'dmey',3);
    D(:,2) = wrcoef('d',c,l,'dmey',2);
    D(:,1) = wrcoef('d',c,l,'dmey',1);
    filename = sprintf('%s_%04f.txt', 'some_name', k)
    csvwrite(filename,D)
end

4 个评论
显示 2更早的评论隐藏 2更早的评论

Robert 2015-5-26

Thanks, fixed it right up :)

Pavel Montes de Oca 2019-8-29

Hello

I had the same need as above and I have solved it with your help. However, I would like to create a single matrix with all data obtained from the analysis of each column. Howcould I do this? Thanks in advance for your help.

请先登录，再进行评论。