How to create input dialog box with drop down menu...????

Asked by Maruti B Patil on 17 Jul 2016

Latest activity Commented on by Walter Roberson on 17 Jul 2016

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I have the following table

Input  A  B
X32  27  4
X46  39  5
X60  59  7
X74  87  9
X88  131  12
X102  194  16

For this table, I want to create input dialog box with a drop-down menu.

Suppose I select X60 from the drop-down menu as an input value, then it should give the output values of A and B as 59 and 7 respectively.

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Answer by Image Analyst on 17 Jul 2016

First you have to put column 1 of the table into the popup. I'm assuming you know how to do that. If not, I think it's something like this:

C = table2cell(T) % Convert table to cell array
handles.popup1.String = C{:, 1};

Though perhaps you don't need to convert to a cell array first now.

Then you need to get the index they selected from the popup and use that to get the other two numbers from the table. Something like (untested)

selectedIndex = handles.popup1.Value; % A number
A = T{selectedIndex, 2};
B = T{selectedIndex, 3};

You can do that from any callback you want since all callbacks have access to all uicontrols.

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Answer by Maruti B Patil on 17 Jul 2016

Edited by Walter Roberson on 17 Jul 2016

Thanks but, it is giving the following error;

Reference to non-existent field 'Value'.

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Maruti B Patil on 17 Jul 2016

I am using MATLAB 2016a.

By using set() & get() also I am getting following error.

Error using get
Conversion to double from struct is not possible.

Image Analyst on 17 Jul 2016

You forgot to include the error message. Please include ALL of it, not just a part of it. Namely, I can't see your line of code that throws the error and I know that the line of code is included in the full error message. You must include ALL the red text if we are to debug it.

Walter Roberson on 17 Jul 2016

I speculate that somewhere in your code, you overwrote handles.popup1 with something else. For example it is not uncommon for people to try something like

handles.popup1 = get(handles.popup1, 'Value');

under the thought that they are recording a copy of the value under the name popup1 and that MATLAB will know that when handles.popup1 is used in the context that requires a handle that MATLAB will know to refer to the handle instead of to the copy of the value that was saved under the same name.

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