How to access variable from workspace and set it as value of a text box.

z = evalin('base', 'z');
numfig = [1];
denfig = [1 0];
sys = tf([numfig],[denfig]);

set(handles.text9, 'String', num2str(z));
set(handles.numtxt, 'String', num2str(numfig));
set(handles.dentxt, 'String', num2str(denfig));

Answer 1

[Stephen23]

Read these:

http://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

http://www.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

And avoid using unreliable, slow and buggy operation like evalin (the following link discusses eval, but the same points also apply to evalin):

http://www.mathworks.com/matlabcentral/answers/196952-how-to-create-new-variables-in-batches-with-strcat

[Harjinder Singh Pabla]

Hi Stephen, I would like to know how I could get a variable I use on matlab command window which is stored/shown in the workspace window. I was thinking of using global but where do I place it in my GUI's M file?

[Walter Roberson]

Use guidata() if you are already using the handles structure. For example,

handles.MyVariable = qx17;   %where qx17 is the variable to send
guidata(gcf, handles);       %update the master copy

then in the routine that needs the value, if the handles structure is already there,

qx17 = handles.MyVariable;   %pull out the saved value

Answer 2

[Image Analyst]

You don't need to access the base workspace - I never do. See the FAQ to learn several better methods of sharing variables between your individual functions' workspaces. http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.28s.29.3F