Load Files from User Input?

Hello,

I am trying to load text files based on a user input.

Let's say I have files A.txt,B.txt,C.txt,D.txt, and E.txt. I would like to prompt the user, "Which file would you like to open?" and have the user input what ever file they want opened. I was thinking it would look something like this:

file = input('What file would you like to open?')
load (file)

But I cannot seem to get this to work. Any help would be appreciated.

[Jan]

Prefer to explain, which problem you see, instead of "but I cannot seem to get this to work".

Answer 1

[Jan]

file = input('What file would you like to open?', 's');
data = load(file)

A more convenient method would be uigetfile or a listdlg.

FileList = {'A.txt', 'B.txt', 'C.txt', 'D.txt', 'E.txt'};
[s,v] = listdlg('PromptString','Select a file:',...
                'SelectionMode','single',...
                'ListString', FileList);

[hemant vyas]

if i want to take a video input from user or webcam what should i do

[Jan]

@hemant vyas: This is another question. Please open a new thread an add more details.

[Garvit Amipara]

Hallo @Jan,

I am new to matlab and have a question related to the same topic.

It is necessary to use the input arguments to load different .mat files(2xn matrix) each time the function is used by user. The number of .mat files to be processed inside the function are also changing, so I used varargout and varargin. For each input, there are 2 output vectors. As input arguments in varargin can be called by varargin{1}, varargin{2}... I tried to use it to load the files. It did not work.

For example, 2 files that should be executed are Data1.mat, Data2.mat

Outputs will be Ans1,Ans2,Ans3,Ans4.

So I used the following command and function file(saved as Data_function.m)

[Ans1,Ans2,Ans3,Ans4]= Data_function (Data1, Data2)

function varargout = Data(varargin)
A= load ('varargin{1}'); %to load first inputargument file name
Ans1 =  A(:,1).*3; %just for example
Ans2 =  A(:,2).*4;
B= load ('varargin{2}') %to load first inputargument file name
Ans3 =  A(:,1).*3; 
Ans4 =  A(:,2).*4;
end

This gives an erro: Unable to read file 'varargin{1}'. No such file or directory.

(The files Data1 and Data2 are in the current folder, where the function is saved)

It would be a great help if you could show the right way to load multiple files.

[Jan]

Replace

A= load ('varargin{1}');

by

A= load (varargin{1});

In the first case, Matlab tries to load a file with the name "varargin{1}.mat".