Sharing information between Callback functions in GUIDE

I'm trying to pass the value that I get in the textbox of edit1_Callback into the pushbutton2_Callback but I keep getting the error message that z_slice is invalid no matter how many times I try to pass it in and even when using the handles method.

function edit1_Callback(hObject, eventdata, handles)

global z_slice;

z_slice=str2double(get(hObject,'String'))

% Hints: get(hObject,'String') returns contents of edit1 as text

% str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes on button press in pushbutton2.

function pushbutton2_Callback(hObject, eventdata, handles)

sf = fit([handles.x3,handles.y3],handles.z3,'cubicinterp');

plot(sf,[handles.x3,handles.y3],handles.z3)

hold on

patch([handles.xmin,handles.xmin,handles.xmax,handles.xmax],[handles.ymin,handles.ymax,handles.ymax,handles.ymin],[z_slice,z_slice,z_slice,z_slice],'w','FaceAlpha',0.7);

title('3D Curve Fit w/Cubic Interpolation')

xlabel('X')

ylabel('Y')

zlabel('Value')

Answer 1

[Rik]

Because hObject is the handle to your pushbutton, you need to explicitly say you want to get the content of the edit box:

z_slice=str2double(get(handles.edit1,'String'))