Padding flag of the formatting operator in compose()

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Cristian Berceanu
Cristian Berceanu 2023-10-31
评论： Dyuman Joshi 2023-11-1
I am trying to get my head around to how the padding flag works. For instance, I get:
>> compose("%05d",45)
ans =
"00045"
Nevertheless, if I try the same using a formatting operator for floating number, this flag seems to do nothing:
>> compose("%05.2f",45.23)
ans =
"45.23"
Why is the result not "00045.23" in this case?
Regards,
Cristian

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采纳的回答

Matt J
Matt J 2023-10-31
Ran in:
Because then the length of the string would be 8 instead of 5.
compose("%08.2f",45.23)
ans = "00045.23"

更多回答（1 个）

Dyuman Joshi
Dyuman Joshi 2023-10-31
编辑：Dyuman Joshi 2023-10-31
Ran in:
The number before the decimal specifies the length/field width of the output string.
Padding will only be there if there is space for it.
sprintf('%0*.2f\n', [6 45.23 7 45.23 8 45.23])
ans =
'045.23 0045.23 00045.23 '
sprintf('%0*.3f\n', [7 123.456 8 123.456 9 123.456])
ans =
'123.456 0123.456 00123.456 '
  2 个评论
Adam Danz
Adam Danz 2023-11-1
Ha! I don't think I've seen this use of sprintf before. It took me a few minutes to figure out that the odd index values of the 2nd argument are space indicators and the even index values the values to be printed. Difficult to read but interesting! Ya learn something new every day! :)

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