if any(answer==[1,2,3])
frequency=input('Enter a frequency: ');
amplitude=input('Enter an amplitude: ');
ccycles=input('Enter a number of cycles: ');
elseif (answer==4)
frequency=input('Enter a frequency: ');
cycles=input('Enter a number of cycles: ');
elseif (answer==5)
tau=input('Enter a time constant: ');
else
error('some error');
end