Switch and Case using radio buttons

Hello! I`m kinda new to radiobuttons and actually matlab, haha.

Problem is: it doesn`t work when I press any of radiobuttons. However, if I write "otherwise" and smth after this - this part works.

Here is the first part of code

hGroup4=uibuttongroup('Units','pixels','Position',[x4,y4,w4,h4]);
rb1=uicontrol(hGroup4,'Style','Radio','String','Periodogram','Position',[5,30,90,20],'Tag','b1');
rb2=uicontrol(hGroup4,'Style','Radio','String','Welch method','Position',[5,10,90,20],'Tag','b2');

set(hGroup4,'SelectedObject',[]);
set(hGroup4,'SelectionChangeFcn',@amadelya1);

and the amadelya1 function

function amadelya1(h,Sel)

%unimportant part

switch get(Sel.NewValue,'Tag')
    case b1
    window=hamming(length(RR4Hz));
    [Pxx,f]=periodogram(RR0,window,nfft,Fs);
    plot(f(1:Nf),Pxx(1:Nf));
    case b2
    Nw=500;
    noverlap=100;
    window=hamming(Nw);
    [Pxx,f]=pwelch(RR0,window,noverlap,nfft,Fs);
    plot(f(1:Nf),Pxx(1:Nf));
    %otherwise
    %anyting here and it works no matter wich button I press
    
  

Sorry for messy explanation and my english

Answer 1

[Chris]

The tag is a string (technically a char vector). Include the quotes.

case 'b1'

and

case 'b2'