How to assign new values to the simulink model blocks while it is executing

function pushbutton1_Callback(hObject,eventdata)
Final_Result=[];
open_system('Desktop\test_Final.slx')
for i=15
set_param('test_Final','StopTime', sprintf('%d',i));
set_param('test_Final','Simulationcommand','start');
options = simset('SrcWorkspace','base');
end

    function pushbutton2_Callback(hObject,eventdata)
    pause(0.44)
    b=5
    assignin('base','b',b)
    set_param('test_Final','Simulationcommand','continue');
    set_param('test_Final','Simulationcommand','update');
  end
How to change the value of b,,,which is constant block im my model,,i just want to change the value of constant block ,,,while simulink model is executing

[Kaustubha Govind]

It looks like you are already changing the value of 'b' in the workspace and running set_param('test_Final','Simulationcommand','update') - does this not work?

[Arun Badigannavar]

Thanks for reply,,,it works