An EEG dataset .txt , I want to transpose the rows and columns for all files.

Question

Rabeah A 2023-9-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2016316-an-eeg-dataset-txt-i-want-to-transpose-the-rows-and-columns-for-all-files

评论： Walter Roberson 2023-9-10

S9 HC.txt

I have an EEG dataset .txt files (55 files) , each file contains 3 columns and hundreds of rows. I want to change all .txt files to 3 rows and hundreds columns (transpose ).

2 个评论
显示无隐藏无

Star Strider 2023-9-3

It is easier in MATLAB to keep them as they are now. I would not change them.

Rabeah A 2023-9-7

Actually I'm new to MATLAB and I have a running code that deals with EEG files such as rows are channels. that's way I want to change them.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2023-9-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2016316-an-eeg-dataset-txt-i-want-to-transpose-the-rows-and-columns-for-all-files#answer_1304366

在 MATLAB Online 中打开

S9 HC.txt

I would still keep them as they are in the files, and transpose them after you read the files.

EEG = readmatrix('S9 HC.txt')                           % Original
EEG = 18204×3
     1703509     1326511     1528584
     1711498     1334520     1536615
     1705921     1328796     1531118
     1694223     1317011     1519531
     1692689     1315472     1517843
     1703451     1326439     1528569
     1711428     1334467     1536607
     1705938     1328835     1531153
     1694351     1317151     1519643
     1692668     1315488     1517863
EEGT = EEG.'                                            % Transposed
EEGT = 3×18204
     1703509     1711498     1705921     1694223     1692689     1703451     1711428     1705938     1694351     1692668     1703313     1711312     1705773     1694428     1692821     1703274     1710918     1705693     1694156     1692196     1702908     1711174     1706023     1694625     1692823     1703394     1711520     1706029     1694092     1692186
     1326511     1334520     1328796     1317011     1315472     1326439     1334467     1328835     1317151     1315488     1326314     1334344     1328729     1317221     1315551     1326341     1334171     1328823     1317164     1315211     1326062     1334344     1329054     1317561     1315857     1326618     1334725     1329054     1316944     1315122
     1528584     1536615     1531118     1519531     1517843     1528569     1536607     1531153     1519643     1517863     1528429     1536389     1530985     1519640     1517866     1528451     1536228     1531088     1519478     1517266     1527826     1536129     1531097     1519718     1517921     1528464     1536523     1531081     1519127     1517216

You can also use the transpose, .' function for this.

In MATLAB there are two kinds of matrix transposition, ‘normal’ transposition (.') and complex conjugate transposition provided by the ctranspose, ' function ('). For real numbers, these are equivalent, however not for complex numbers. For N-dimensional matrices, there is also pagetranspose, that does a non-conjugate transposition, and for good measure, I will introduce you to the permute function.

.

9 个评论
显示 7更早的评论隐藏 7更早的评论

Rabeah A 2023-9-10

编辑：Walter Roberson 2023-9-10

在 MATLAB Online 中打开

I am sorry I'm confused about where to add these lines..

I am working on a classification problem, I named the .txt files either H or N, H files belonging to the yes group while N files belong to no group. so I used this script to read the files and then separate them into an approperate group. then I save them as .mat file (which contains 2 groups, each group containing its files). Later on, I will segment the EEG and process it .. so where should I write these lines?

pathM = [pathd, '/MAT Files/'];
pathd = [pathd, '/EEG_3/'];
YES = {};
NO  = {};
samples  = dir(fullfile(pathd, '*.txt'));
samples  = {samples.name};
samples  = samples';
numSamps = size(samples, 1);
numYES = 1;
numNO  = 1;
for i = 1:numSamps
    samp    = char(samples(i,:));
    type    = samp(end-7:end-4);
    state   = samp(end-4:end-3);
    if state == 'H'
        YES{numYES,1} = samp;
        numYES = numYES + 1;
    elseif state == 'N'
        NO{numNO, 1} = samp;
        numNO = numNO + 1;
    end
end
save([pathM, 'EEG_3channels', '.mat'], 'YES', 'NO'); 

Thank you..

Rabeah A 2023-9-10

I'll try to explain what the code dose:

I have binart clasification problem ( yes , no ). the data is labled by the file name if the name contains H so it belongs to group "yes". and if the name contains N so it belongs to group "no".

first I create the datafiles by accessing the dataset folder and seperate the files by names into belonging group and save this in( DATA.mat) file.

afterthat, I want to prepare the data for training and testing and segment the data.

whe I want to do step 2, I rty to read the .txt files in ( DATA.mat ) file.

Here I share segment of the code that works with .edf files and reads the files ( the underlined lines) then segment them:

function [DataX, DataY ] = SegmentEEGIntoInstances (file, label, PLength, stride, channels)

[data, header] = edfread(file{1,1});

EEG = header(channels, :);

EEGLength = size(EEG,2);

numInstances = 1+floor((EEGLength- PLength)/stride);

..... etc

My problem here how can I read with .txt datasets and change the rows to be the channels so I can segment the data and train the model.

kindly, check your inbox.

Star Strider 2023-9-10

Please upload a representative EDF file here. If that is not a valid file type, use the zip function to enclose it in a .zip file and then upload that.

I will also need the entire code of the ‘SegmentEEGIntoInstances’ function so I can see what you are doing with the file.

(I do not do anything offline. I keep everything here so it all makes sense, if anyone else has similar problems and needs to see this solution.)

Walter Roberson 2023-9-10

Please see http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

请先登录，再进行评论。

Answer 2

Abderrahim. B 2023-9-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2016316-an-eeg-dataset-txt-i-want-to-transpose-the-rows-and-columns-for-all-files#answer_1300156

Hi!

You can try a for loop, however there is a better way to do this is to use tabularTextDatastore(location) and then use readall function to read all the file, later on you can transpose and do whatever you want with the readall function output.

Let me know if this helps.

Abderrahim

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。

An EEG dataset .txt , I want to transpose the rows and columns for all files.

2 个评论
显示无隐藏无

回答（2 个）

9 个评论
显示 7更早的评论隐藏 7更早的评论

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

另请参阅

类别

标签

Community Treasure Hunt

An EEG dataset .txt , I want to transpose the rows and columns for all files.

2 个评论 显示 无隐藏 无

回答（2 个）

9 个评论 显示 7更早的评论隐藏 7更早的评论

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

另请参阅

类别

标签

Community Treasure Hunt

2 个评论
显示无隐藏无

9 个评论
显示 7更早的评论隐藏 7更早的评论

0 个评论
显示 -2更早的评论隐藏 -2更早的评论