gui popupmenu problem with limits
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Hello, I want to create an app that counts the limit of a function at an exact point. I need to use a popup menu to select whether the border is to the right or left. There's my code, why isn't it working? Could you help me?
function mat
f = figure('Visible','off',...
'Position',[480,500,500,480]);
pushbutton = uicontrol('Style','pushbutton',...
'String','count',...
'Position',[285,63,70,25],...
'Callback',@border);
hinput_g = uicontrol('Style','edit',...
'Position',[120, 200,240,35],...
'String','function','FontSize',13, 'FontName','silom');
hinput_granica = uicontrol('Style','edit',...
'Position',[120, 100,240,35],...
'String','limit at point','FontSize',13);
hpopup_g = uicontrol('Style','popup',...
'String',{'right','left'},...
'Position',[130,50,140,35]);
set(f,'Name','My app gui');
set(f,'Visible','on');
function border(~,~)
x = get(hinput_g,'String');
x = str2sym(x);
a = get(hinput_granica, 'String')
a = str2num(a);
idx = get(hpopup_g,'Value');
str = get(hpopup_g, 'String');
popup_str = str{idx};
if popup_str == 'right'
c = limit(x, a,'right');
msgbox(sprintf(char(c)));
elseif popup_str == 'left'
c = limit(x, a,'left');
msgbox(sprintf(char(c)));
end
end
end
5 Comments
Answers (1)
Raghav
on 5 Apr 2023
Hi,
Based on your question, I understand that you are facing difficulty using limit function.
The error message suggests that the variable a is not a symbolic variable.
In the border function, you are converting the string input from the hinput_granica edit box to a numeric value using the str2num function. However, limit function from the Symbolic Math Toolbox expects a symbolic variable as the second input, not a numeric value.
To fix the issue, you should create a symbolic variable using the sym function and use it as the second input to the limit function.
The official documentation for limit & sym function is mentioned below respectively:
Hope it helps!
Thanks,
Raghav Bansal
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