load a data

I know that we can load data with different format,

I would like to put in a loop for example if I==1; load .... end

something that if the data is saved in *.txt or *.xls or *.mat or anything which Matlab can read it

the name of the file let say saved as X.

therefore

if I==1 load X load X.txt numeric= xlsread('X'); if I==2 uiimport end end

but I would likein the first step if i==1 , then if the file was one those format, then be loaded by Matlab

[Niki]

maybe this ?

if I==1

load X

elseif

load X.txt

elseif

numeric= xlsread('X');

elseif I==2

uiimport

end

end

Answer 1

[Walter Roberson]

loadworked = false;
try
  load(X)
  loadworked = true;
end

if ~loadworked
  try
    uiimport(X);
    loadworked = true;
  end
end

if ~loadworked
  error('Bleh, could not load or import the file!')
  return
end

[Niki]

Thanks Walter but I would like to put 1 or 2

because i use of input ('Import data=> from file=1, from workspace=2 ? ');

Answer 2

[Fangjun Jiang]

importdata() automatically does that. What is your purpose? To learn if-else statement?

To check the file extension, use fileparts().

I=input('Import data=> from file=1, from workspace=2 ? ');
if I==1
    [PathStr,File]=uigetfile;
    [Trash,FileName,FileExt]=fileparts(File);
    if strcmpi(FileExt,'.txt')
       a=textread(File);
    elseif strcmpi(FileExt,'.mat')
       a=load(File);
    elseif strcmpi(FileExt,'.xls')
      a=xlsread(File);
    else
      error('Unrecognized File!');
    end
elseif I==2
    %do stuff
else
    error('Invalid input');
end

[Niki]

Thanks Fangiun, as I said to Walter, I would like to put a command whether the data can be loaded from workspace or from file

then I would like if it is supposed to be loaded from directory (current folder) then if the file is in xls or any other format, it can be loaded without any problem

[Fangjun Jiang]

Okay, what do you want to do if from workspace?

[Niki]

you think I should not mention a while ? because if it is not 1 nor 2 , then the program will stop , No?

therefore it should be something that until I enter 1 or 2 , the program need the input

on the other hand, I would like to read the data from a file

then I use of >>uiimport

I would like the program stay until I load the data using uiimport and then continue and not when I load the data then it stop

[Fangjun Jiang]

See edit. You can use uiimport() or importdata()