Left digits
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if I have a number such as 1234, how can I select the left 3 digits 123?
采纳的回答
Sean de Wolski
2011-6-14
left3 = @(x)str2double(x(1:3));
left3(num2str(1234))
Perhaps?
Or so it doesn't error on numbers < 100
left3 = @(x)str2double(x(1:min(3,length(x))));
更多回答（2 个）
Walter Roberson
2011-6-14
You can do it arithmetically with something like
floor(x ./ 10.^ceil(log10(x+1)-3))
provided the values are at least 100
Paulo Silva
2011-6-14
n=num2str(1234)
n1=str2num(n(1:end-1))
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2011-6-14
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