GUI edit text and msgbox problem .. what do I miss

Hello,

yesterday I programed partial code that does check values in edit text field for NUMBER and then If that is a number pops out msgbox where that number is shown othervise it htere is STR it pops msg box ERROR.

Unfortunately! It worked well till now. I'm not aware of changing anything! And I cannot find problem.

function koefm_Callback(hObject, eventdata, handles)
input = get(handles.koefm,'String'); %get the input from the edit text field
input = str2num(input); %change from string to number

if isempty(input) 
    msgboxText{1} =  'BLAH BLAH'; 
    msgbox(msgboxText,'BLAH', 'error');
    set(handles.koefm,'String','2') % sets default value
else
   input = num2str(input);
   msgboxText{1} =  'blah blas';
    msgboxText{2} =  strcat('blah blah',{' '},input)  ;
    msgbox(msgboxText,'INFO');

end

It should be in conversion but I can't see the problem.. help please :P

BTW this is command line error msg input =

       6

input =

6

??? Undefined function or method 'eq' for input arguments of type 'cell'.

Error in ==> textwrap at 99
    Loc=find(Para==ReturnChar);

Error in ==> msgbox at 283
[WrapString,NewMsgTxtPos]=textwrap(MsgHandle,BodyTextString,75);

Error in ==> GUI>koefm_Callback at 95
    msgbox(msgboxText,'INFO');

Error in ==> gui_mainfcn at 96
        feval(varargin{:});

Error in ==> GUI at 42
    gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)GUI('koefm_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback

Answer 1

[Matt Fig]

This works:

input = get(handles.koefm,'String'); %get the input from the edit text field
% No need to convert to number...  

if isempty(input)
    msgboxText{1} =  'BLAH BLAH';
    msgbox(msgboxText,'BLAH', 'error');
    set(handles.koefm,'String','2') % sets default value
else
    msgboxText{1} =  'blah blas';
    msgboxText{2} =  ['blah blah',' ',input];  % The error was here. 
    msgbox(msgboxText,'INFO');
end

The error was that you were using STRCAT to make a cell array with a sub-cell... Look at the results of what you did:

msgboxText{1} =  'blah blas';
msgboxText{2} =  strcat('blah blah',{' '},'45')
msgboxText = 
    'blah blas'    {1x1 cell}

[Lex]

Thank you mr. Fig :) It worked well even althrough that first conversion was needed. Because It secures field from String valuse.

So I've splitted field to two inputs ;p Input1 is converted to strink and tested for emptyness and after Else statement there is one more input2 where was conv. problem.

THANKS once again! (I'm new a guy to GUI :P )