iterate through multiple files in a folder

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.

[Rik]

How to process a set of files may be the most frequently asked question on this site. What have you tried so far?

[Nitish Reddy Kotkur]

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]

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

Answer 1

[Katarina Vuckovic]

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

Answer 2

[Cathal]

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