Linking uicontrol edit to a variable

How do I make the link between the uicontrol edit box to the variables, as explained in the following picture?

clear all; close all;

%Start - predefinite

   grey1 = [0.8 , 0.8 , 0.8];
   grey2 = [0.7 , 0.7 , 0.7];
   grey3 = [0.6 , 0.6 , 0.6];
   %R=(get(Be1,'Value'));

   R = 5;
   L = 2;
   C = 0.2;

   V = 10;  %amplitudinea 10V
%End -  predefinite

%Start - Fereastra principala Fig=figure('Name','Circuit RLC Serie',... 'Units','normalized',... 'Position',[0.25 0.25 0.5 0.5],... 'NumberTitle','off','color',grey1);

    %Start - Imagine PSpice
        axes('position',[0.513 0.16 0.50 0.28])
        x = imread('circuit.jpg');
        image(x)
        axis off
        axis image
    %End - Imagine PSpice

    %Start - Butoane RLC + Text
        edit_r=uicontrol('Style','edit',...
        'Units','normalized',...
        'Position',[0.6 0.88 0.16 0.05],...
        'foregroundcolor','b',...
        'Value',5,...
        'Callback','');

        edit_h=uicontrol('Style','edit',...
        'Units','normalized',...
        'Position',[0.6 0.78 0.16 0.05],...
        'foregroundcolor','b',...
        'Value',5,...
        'Callback','');

        edit_c=uicontrol('Style','edit',...
        'Units','normalized',...
        'Position',[0.6 0.68 0.16 0.05],...
        'foregroundcolor','b',...
        'Value',5,...
        'Callback','');

        Bt1=uicontrol('Style','text',...
        'Units','normalized',...
        'Position',[0.76 0.889 0.05 0.03],...
        'backgroundcolor',grey1,...
        'foregroundcolor','black',...
        'String','R (Ohm)'); 

        Bt2=uicontrol('Style','text',...
        'Units','normalized',...
        'Position',[0.765 0.789 0.05 0.03],...
        'backgroundcolor',grey1,...
        'foregroundcolor','black',...
        'String','L (Henry)'); 

        Bt3=uicontrol('Style','text',...
        'Units','normalized',...
        'Position',[0.764 0.689 0.05 0.03],...
        'backgroundcolor',grey1,...
        'foregroundcolor','black',...
        'String','C (Farad)'); 

         Bt_diagrama=uicontrol('Style','text',...
        'Units','normalized',...
        'Position',[0.664 0.089 0.2 0.05],...
        'backgroundcolor',grey1,...
        'foregroundcolor','black',...
        'String','Diagrama circuit RLC serie'); 

    Bp=uicontrol('Style','pushbutton',...
 'Units','normalized',...
 'Position',[0.6315 0.6 0.1 0.05],...
 'String','Apply',...
 'Callback','close'); 
    %End - Butoane RLC + Text

    %Start - Diagrame
        axes('position',[0.07 0.66 0.45 0.3])          
        x=0.1:0.1:10000;                                    % Scara axei X
        p=1i*x;                                             % Laplace
        FT=V./(L*C*p.*p + R*C*p + 1);                       % Functia de transfer
        MFT=20*log10(abs(FT));                              % Modulul functiei de transfer
        semilogx(x,MFT,'LineWidth',2,'Color','red');        % Modulul functiei de transfer intr-un grafic semilog
        xlabel('Frecventa [ Hz ]');                         
        ylabel('Castig [ dB ]');
        legend('Castig [ dB ]');                            % Legenda
        grid on                                             % Grid

        axes('position',[0.07 0.15 0.45 0.3])                
        phase=angle(FT)*(180/pi);                           % Faza
        semilogx(x,phase,'LineWidth',2,'Color','red');      % Faza intr-un grafic semilog
        xlabel('Frecventa [ Hz ]');
        ylabel('Faza [ ° ]');
        legend('Faza [ ° ]');                               % Legenda
        grid on                                             % Grid
    %End - Diagrame

%End - Fereastra principal