Getting value from a listbox. Error: Cell contents reference from a non-cell array object.

2 次查看（过去 30 天）
Manuel
Manuel 2013-8-23
Im trying to get the value selected in a listbox(Temp_listbox) by a callback botton and the listbox contains cells of integers:
string5 = get(handles.Temp_listbox, 'String');%%get cond1
value5 = get(handles.Temp_listbox, 'Value');
cond1 = string5{value5};
But I got the error: Cell contents reference from a non-cell array object.
Any idea about how could be solved? Thanks in advance.
Note: The value of cond1 is used afterwards to find the intersection in an array and plot the data.
  2 个评论
David Sanchez
David Sanchez 2013-8-23
Are you sure this error message makes reference to these lines of code? They seem all right and should not yield an error.
Manuel
Manuel 2013-8-23
I think so, the error is :
Cell contents reference from a non-cell array object.
Error in GUI_v1>plot1_Callback (line 405)
cond1 = string5{value5};
And in the same callback function I have also similar code but for other listboxs and is working correctly :
string3 = get(handles.listchip_version, 'String');%%get chip version
value3 = get(handles.listchip_version, 'Value');
chip1 = string3{value3};
string4 = get(handles.listtest, 'String');%%get test version
value4 = get(handles.listtest, 'Value');
test1 = string4{value4};
The only different in the cond1 is the content of the listbox which one is a number and not a string value.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Grzegorz Knor
Grzegorz Knor 2013-8-23
I suppose that your listbox contains only one string. Compare two codes:
1:
lb = uicontrol('Style','listbox','Position',[10 10 100 100],'String','a');
a = get(lb,'String');
a{get(lb,'Value')}
2:
lb = uicontrol('Style','listbox','Position',[10 10 100 100],'String',{'a','b','c'});
a = get(lb,'String');
a{get(lb,'Value')}
Code 1 produces an error.
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2013-8-23
Also watch out for the case where the String property is empty.
If you are not absolutely positive that the String property will be cell array, then cellstr(get(TheHandle, 'String'))
At one point in an old Answer, I listed the conditions under which the String property would not be a cell array.
Manuel
Manuel 2013-8-26
Hello Walter, you are right when the string property is empty does not work, with
cellstr(get(TheHandle, 'String'))
works perfect.
Thank you very much!

请先登录，再进行评论。

更多回答（1 个）

ES
ES 2013-8-23
Not sure, you must be doing something wrong. It works fine,
if true
eg:
set(handles.listbox1, 'String',{1,2,3,4})% to set set of integers as entries for the list box.
and somewhee else,
string5 = get(handles.listbox1, 'String');%%get cond1 value5 = get(handles.listbox1, 'Value'); cond1 = string5{value5};
output is cond1=1 end
please check..
  1 个评论
Manuel
Manuel 2013-8-23
I check and the error is still there :
Cell contents reference from a non-cell array object.
Error in GUI_v1>plot1_Callback (line 405)
cond1 = string5{value5};
And in the same callback function I have also similar code but for other listboxs and is working correctly :
string3 = get(handles.listchip_version, 'String');%%get chip version
value3 = get(handles.listchip_version, 'Value');
chip1 = string3{value3};
string4 = get(handles.listtest, 'String');%%get test version
value4 = get(handles.listtest, 'Value');
test1 = string4{value4};
The only different in the cond1 is the content of the listbox which one is a number and not a string value.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Graphics Object Programming 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by