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find the errors in the MATLAB codes The program runs, then stops and gives an error of double going into the switch

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find the errors in the MATLAB codes

The program runs, then stops and gives an error of double going into the switch. I changed the code to make it output the sounds, but my whole reasoning was to make this version work with the row vectors.

%taking input phone numbers

Horvector=[1209 1336 1477];
Vervector=[697, 770, 852, 941];

x=input('Enter Phone Number: ','s');

a=0.5;
t=0:1/8192:0.5;
for i=1:length(x)
y=z(i);
switch y

case '1'
z(i)=a*sin(2*pi*Horvector(1)*t) + a*sin(2*pi*Vervector(1)*t);
case '2'
z(i)=a*sin(2*pi*Horvector(2)*t) + a*sin(2*pi*Vervector(1)*t);
case '3'
z(i)=a*sin(2*pi*Horvector(3)*t) + a*sin(2*pi*Vervector(1)*t);
case '4'
z(i)=a*sin(2*pi*Horvector(1)*t) + a*sin(2*pi*Vervector(4)*t);
case '5'
z(i)=a*sin(2*pi*Horvector(2)*t) + a*sin(2*pi*Vervector(2)*t);
case '6'
z(i)=a*sin(2*pi*Horvector(1)*t) + a*sin(2*pi*Vervector(2)*t);
case '7'
z(i)=a*sin(2*pi*Horvector(1)*t) + a*sin(2*pi*Vervector(3)*t);
case '8'
z(i)=a*sin(2*pi*Horvector(2)*t) + a*sin(2*pi*Vervector(3)*t);
case '9'
z(i)=a*sin(2*pi*Horvector(3)*t) + a*sin(2*pi*Vervector(3)*t);
case '*'
z(i)=a*sin(2*pi*Horvector(1)*t) + a*sin(2*pi*Vervector(4)*t);
case '0'
z(i)=a*sin(2*pi*Horvector(2)*t) + a*sin(2*pi*Vervector(4)*t);
case '#'
z(i)=a*sin(2*pi*Horvector(3)*t) + a*sin(2*pi*Vervector(4)*t);

otherwise

disp('Enter a valid number or * or #')

end
end

%to listen to the tones with a 0.25 sec pause between each tone

for i=1:length(x)
sound(z(i));
pause(0.25);
end