Using a slider Value to set a gain in simulink

I'm using A slider from a GUI to set a parameter on a simulink model that it is controlling and I cant seem to input the data correctly for the gain. Can anyone explain to me why this is not happening.

**The simple code im using is:

% --- Executes on slider movement. function height_slider_Callback(hObject, eventdata, handles) % hObject handle to height_slider (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'Value') returns position of slider % get(hObject,'Min') and get(hObject,'Max') to determine range of slider

z_position=get(handles.height_slider,'Value');

set_param('manualflight/flight_plan/zset', 'Gain', z_position);

set_param('manualflight','SimulationCommand','update')*

The error code that comes up is :

??? Error using ==> guimanualflight>height_slider_Callback at 96 Invalid setting in Gain block 'zset' for parameter 'Gain'.

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> guimanualflight at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)guimanualflight('height_slider_Callback',hObject,eventdata,guidata(hObject))

??? Error using ==> drawnow Error while evaluating uicontrol Callback

THanks

Answer 1

[Paul]

HAve solved it myself . For simunlink gain it requires a string value instead of a nuber value so adding the num2str comand will solve this problem:

z_position=get(handles.height_slider,'Value');

set_param('manualflight/flight_plan/zset', 'Gain', num2str(z_position));

set_param('manualflight','SimulationCommand','update')*

[DinhBa]

THank you very much. it helped me alot.