Number of leading zeroes as a variable

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James
James 2016-10-24
回答： Honglei Chen 2016-10-24
I know that to print out a number with a certain amount of leading zeroes, you are supposed to use %0X, where X is the number of digits you want in your output. For example, sprintf('%06g',13) gives you the string '000013' as output. Is there a way to make the formatting value a variable? Something along the lines of
function x=leadzero(y,z)
x=sprintf('%0y',z)
end
I know it can be done with a for loop, but is there are way to implement this directly into the sprintf command?

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采纳的回答

dpb
dpb 2016-10-24
Fer shure, just write the format string desired dynamically--
function s=leadzero(Nz,z)
fmt=num2str(Nz,'%%0%dg');
s=sprintf(fmt,z)
end
Nz for "Number zeros" seemed a better variable name than y as did an s for a returned string output variable...the format string expression can be wrapped inside the sprintf call, of course, just wrote it out for clarity here.

更多回答（1 个）

Honglei Chen
Honglei Chen 2016-10-24
y = 6;
z = 13;
sprintf(['%0' num2str(y) 'g'],z)

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