Create contents of popup menu dynamically

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Luffy 2012-7-4

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评论： Samuel Hirsbrunner 2016-7-23

 I want to create a popup menu with contents dynamically,based on value of a variable n in my code.
 Example:- If n is 2,the contents should be Data1,Data2.
           If n is 3,the contents should be Data1,Data2,Data3.  
           ...................................................
           If n is x,the contents should be Data1,Data2,......Datax

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Jan 2012-7-4

Ok. What have you tried so far and what problems occurred? Did you read "doc uicontrol" already?

Luffy 2012-7-5

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 Yeah I know about uicontrol,I tried this:
 v = evalin('base','n');  % n is variable i explained in question.
 switch v
 Case 1
  uicontrol('Style', 'popupmenu', ...
            'String', {'Data1'}, ...
            'Units', 'pixels', ...
            'Position', [370, 60, 95, 21]);
 Case 2
   uicontrol('Style', 'popupmenu', ...
             'String', {'Data1','Data2'}, ...
             'Units', 'pixels', ...
             'Position', [370, 60, 95, 21]);
 Case 3
  uicontrol('Style', 'popupmenu', ...
            'String', {'Data1','Data2','Data3'}, ...
            'Units', 'pixels', ...
            'Position', [370, 60, 95, 21]);
 end
 But what if value of n is 100,I can't go on writing switch cases.

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Answer 1

Mark Whirdy 2012-7-4

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Hi Luffy

Not 100% sure I understand the degree of dynamism you're going for but stick the code below underneath whereever n changes (assuming handles is in scope there). Here you specify the menu contents cell array explicity in each case - does this fit your use-case?

switch n case 1 set(handles.popupmenu1,'String',{'Data1';'Data2'},'Value',1); case 2 set(handles.popupmenu1,'String',{'Data1';'Data2';'Data3'},'Value',1); end

Alternatively, if for some reason you're defining the contents to be a cellaray of 'Data#' whose length = n, then the code below should do it

n = 4; myarray = strcat('Data',cellfun(@num2str,num2cell((1:n)'),'UniformOutput',false)) set(handles.popupmenu1,'String',myarray,'Value',1);

All the best Mark

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Luffy 2012-7-5

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 @Mark:thank you,but could you tell me that 'Value',1 in
 set(handles.popupmenu1,'String',myarray,'Value',1) mean

Jan 2012-7-5

Please read "doc uicontrol". The 'Value' is the initially selected item.

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Answer 2

Jan 2012-7-5

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String  = sprintf('Data%d#', 1:n);
String(end) = [];
CString = regexp(String, '#', 'split');
uicontrol('Style', 'popupmenu', ...
          'String', String, ...
          'Units', 'pixels', ...
          'Position', [370, 60, 95, 21]);