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IF statement restarting when condition is true

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hello i make an IF statement:
d=input('Is this spur gear mounted between two bearing? (Y/N): ','s');
if d=='N'
error('this program is not for you');
elseif d~='Y' | d~='N'
disp('you must use capital letters')
return
end
i would, if the second condition is true, to restart the code from
d=input('...
how can i do this?

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Rick Rosson
Rick Rosson 12 Mar 2016
편집: Rick Rosson 12 Mar 2016
k = [];
while isempty(k)
d=input('Is this spur gear mounted between two bearing? (Y/N): ','s');
k = findstr(upper(d),'YN');
if isempty(k)
fprintf('Invalid response. Please try again.\n');
end
end

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