Error: Array indices must be positive integers or logical values

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I am trying to make a GUI that allows me to make a grid with the dimensions of the grid as inputs. My for loop works outisde of the 'guide' editor to do this, but when I copy and paste it into the GUI code with the proper callbacks, I get an "array indices must be positive integers or logical values" error. Some of my values are not integers and must stay that way. Please let me know what I can do to fix this.

here is the GUI code for just the pushbutton to run the function

% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
clc
s=str2double(get(handles.initial_x,'string'));
lowerbound=str2double(get(handles.initial_y,'string'));
f=str2double(get(handles.end_x,'string'));
upperbound=str2double(get(handles.end_y,'string'));
n=str2double(get(handles.slider1,'Value'));
x=linspace(s,f,n);
y=linspace(lowerbound,upperbound,n);
for i=1:n
    xi=x;
    yi=y(i)*ones(size(xi));
    plot(xi,yi,'b')
    hold on
end
for i=1:n
    yi=y;
    xi=x(i)*ones(size(yi));
    plot(xi,yi,'b')
    hold on
end
xl=s-20;
xu=f+20;
xlim([xl xu]);