help me one thing matlab plot

function hh
      N=800;
      M=600;
      A = 0; F = 0; S = 0; Fi=0;
      Fs=100;
      Ts=1/Fs;
      t=[-6:Ts:6];
handles.fig=figure();
mpos=get(handles.fig,'position');
set(handles.fig,'units','pixel');
set(handles.fig,'position',[mpos(3)-120 mpos(4)-250 N M]);
handles.axes1=axes();
set(handles.axes1,'units','pixel');
handles.axes1=subplot(3,1,1);
handles.axes2=axes();
set(handles.axes2,'units','pixel');
handles.axes2=subplot(3,1,2);
handles.axes3=axes();
set(handles.axes3,'units','pixel');
handles.axes3=subplot(3,1,3);
handles.filter1=uicontrol('style','radiobutton');
set(handles.filter1,'string','low pass');
set(handles.filter1,'position',[100 200 80 20]);
handles.filter2=uicontrol('style','radiobutton');
set(handles.filter2,'string','highpass');
set(handles.filter2,'position',[100 180 80 20]);
handles.filter3=uicontrol('style','radiobutton');
set(handles.filter3,'string','band pass');
set(handles.filter3,'position',[100 160 80 20]);
handles.edit1=uicontrol('style','edit');
set(handles.edit1,'position',[N-360 0 120 20]);
set(handles.edit1,'string','A');
set(handles.edit1,'horizontalalignment','center');
set(handles.filter1,'callback',{@mycallback, handles, 1});
set(handles.filter2,'callback',{@mycallback, handles, 2});
set(handles.filter3,'callback',{@mycallback, handles, 3});
handles.edit1 = uicontrol('style','edit');
set(handles.edit1,'position',[N-360 0 120 20]);
set(handles.edit1,'string','A');
set(handles.edit1,'horizontalalignment','center');
handles.edit2 = uicontrol('style','edit');
set(handles.edit2,'position',[N-240 0 120 20]);
set(handles.edit2,'string','F');
set(handles.edit2,'horizontalalignment','center');
set(handles.edit1, 'callback', @edit_callback1);
set(handles.edit2, 'callback', @edit_callback2);
function edit_callback1(src, event_data)
  A = str2double( get(src, 'String') );
end
function edit_callback2(src, event_data)
  F = str2double( get(src, 'String') );
  S=A*cos(2*pi*F*t);
  plot(handles.axes1, t, S);
  end
function mycallback(gcf, event_data, handles, filter_num)
switch filter_num        
    case 1
    set(handles.filter1,'value',1);
    set(handles.filter2,'value',0);
    set(handles.filter3,'value',0);
      Fi=rectpuls(t/4);
      plot(handles.axes2,t,Fi);
      axis(handles.axes2, [-6 6 0.01 2]);
      xlabel(handles.axes2,'frequency(hz)');
      ylabel(handles.axes2,'Filter');
      title(handles.axes2,'Low Pass Filter impulse');
      plot(handles.axes3, t, (Fi*S));
      case 2
      set(handles.filter1,'value',0);
      set(handles.filter2,'value',1);
      set(handles.filter3,'value',0);
      Fi=1*(t>3)+1*(t<(-3));
      plot(handles.axes2,t,Fi);
      axis(handles.axes2, [-6 6 0.01 2]);
      xlabel(handles.axes2,'frequency(hz)');
      ylabel(handles.axes2,'Filter');
      title(handles.axes2,'High Pass Filter impulse');
      plot(handles.axes3, t,(Fi*S));
      case 3
      set(handles.filter1,'value',0);
      set(handles.filter2,'value',0);
      set(handles.filter3,'value',1);
      Fi=1*(t>2&t<4)+1*(t<(-2)&t>-4);
      plot(handles.axes2,t,Fi);
      axis(handles.axes2, [-6 6 0.01 2]);
      xlabel(handles.axes2, 'frequency(hz)');
      ylabel(handles.axes2,'Filter');
      title(handles.axes2, 'Band Pass Filter frequency');
      plot(handles.axes3, t, (Fi*S));
  end
      end
  end

please one thing

why not work

plot(handles.axes3, t, (Fi*S));

Answer 1

[Walter Roberson]

Change F*S to F.*S

While you are at it, stop naming a callback parameter "gcf". name it "src" or "hObject".

Note: you create handles.edit1 twice.

Note: You are using nested functions. You do not need to pass handles in to mycallback and if you do pass it in then you are not going to get the handles structure that you think you are going to get.