iterate through multiple files in a folder

Question

Nitish Reddy Kotkur 2019-10-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486307-iterate-through-multiple-files-in-a-folder

编辑： Cathal 2023-7-18

function [] = lanczos(A, m)
A = readmatrix('output1.txt','Whitespace',' []');

here A reads a single text file.

But i wanted A to read multiples text files(may be using for loop) stored in a folder(say graphs) and the function needs to run through all of them and display output for every text file.

can someone help me with this.

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Nitish Reddy Kotkur 2019-10-19

编辑：Rik 2019-10-20

在 MATLAB Online 中打开

myfolderinfo=dir('dense_gnm_random_graph');%dense_gnm_random_graph is the folder which contains text files
N=length(myfolderinfo);
for i = 3:N
    thisfile = myfolderinfo(i).name
A = readmatrix('thisfile','Whitespace',' []');

and these are the errors i got

Error using readmatrix (line 148)
Unable to find or open 'thisfile.txt'. Check the path and filename or file permissions.
Error in final (line 6)
A = readmatrix('thisfile.txt','Whitespace',' []');

Rik 2019-10-20

The source of the error is that you entered the variable name as a char array instead of the contents of the variable.

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Answer 1

Katarina Vuckovic 2019-10-20

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486307-iterate-through-multiple-files-in-a-folder#answer_397239

在 MATLAB Online 中打开

myDir = uigetdir; %gets directory
myFiles = dir(fullfile(myDir));
M(length(myFiles),s)=zeros; %gets all wav files in struct
for k = 1:length(myFiles)
    baseFileName = myFiles(k).name;
    fullFileName = fullfile(myDir, baseFileName);
    A = readmatrix(fullFileName,'Whitespace',' []');
end

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Answer 2

Cathal 2023-7-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/486307-iterate-through-multiple-files-in-a-folder#answer_1274828

编辑：Cathal 2023-7-18

在 MATLAB Online 中打开

Expanding on Katarina's answer, this worked for me with some small changes:

myDir = uigetdir; %gets directory
myFiles = dir(fullfile(myDir, '*.txt'));
M(length(myFiles))=zeros; %gets all wav files in struct
for k = 1:length(myFiles)
    baseFileName = myFiles(k).name;
    fullFileName = fullfile(myDir, baseFileName);
    A = readtable(fullFileName,'Whitespace',' []');
    
    %Assuming by display you mean to plot?
    plot(A{:,1}, A{:,2}, Marker=".") %Replace {:,1} and {:,2} with whatever
    hold on
    
end