error message for wrong data loaded

Hi everybody,

In my GUI I´m loading data and storing them into variables X and y. The a value is entered by user.It looks like that:

[FILENAME,PATHNAME]=uigetfile('*.txt')
loaddata=load(FILENAME)
if (a==1)
 X = loaddata(:,1)
 y = loaddata(:,2)
end
if (a==2)
X = loaddata(:,1:2)
y = loaddata(:,3)
end
...

But I would like to add an error message in case that user load the wrong data set if he set the value a is equal for example to 1. Do you guys have any idea ? TY for help

Answer 1

[Walter Roberson]

See error() and warning() and warndlg() and disp() and fprintf()

[Lenka Misenkova]

Thank you for your answer but I already know how to display error message. What I need is to make an condition something like: if (something is wrong) errordlg('Wrong data loaded'); end. So I ´m missing the if part.

[Valmir Sadiku]

whence comes the 'a'? Is it user input data? You have to put more effort to get an answer.

[Valmir Sadiku]

Sorry, my mistake.

If 'a' is an input data then you can simply do it in this way:

if( a == 1)

% load data set 1

elseif (a == 2)

% load data set 2

elseif (a == x)

% load data set x

else  % wrong input from the user

% print error message

end

regards V.Sadiku

[Lenka Misenkova]

uhm, but the user set value a(to be equal to 2) that means that his data are supposed to have 2 dependendent variable and one independent variable. It means his data have 3 columns. So imagine that he sat that he have 2 independent variables but he mistankely load data which have for example 4 or 5 columns. That´s the problem. I m sorry that I wasn´t descirbe exactly my problem earlier, but my english isn ´t also that good :D

[Walter Roberson]

if ndim(loaddata) ~= 2 | size(loaddata,2) ~= 3

[Lenka Misenkova]

Thank you ver much that works

[Walter Roberson]

If your difficulty is solved, please mark this Answer as Accepted.