How to convert some numbers to strings with the max length?

for example, I want to convert 1 to 32 to strings length 2, if shorter, '0's are added to the front of the strings. 1 -> '01', 2 -> '02', ..., 32 -> '32'.

Answer 1

[Image Analyst]

str = sprintf('%2.2d', yourInteger)

[Qiu]

thank you for your answer, but if the length of the number is determined when the program is executed, how to solve it?

[Image Analyst]

Is this what you mean?:

% Get a format specifier string for the biggest number we expect to ever have.
yourBiggestInteger = 123456
numDigits = ceil(log10(yourBiggestInteger))
formatSpecifierString = sprintf('%%%d.%dd', numDigits, numDigits)

% Test code:
yourInteger = 12;
str = sprintf(formatSpecifierString, yourInteger)
yourInteger = 1234;
str = sprintf(formatSpecifierString, yourInteger)

In the command window:

yourBiggestInteger =
      123456
numDigits =
     6
formatSpecifierString =
%6.6d
str =
000012
str =
001234

[Qiu]

Thank you very much! That's what I need.

Answer 2

[the cyclist]

An alternative to Image Analyst's (but I prefer his method):

str = num2str(yourInteger,'%02d')

[Qiu]

thank you for your answer, but if the length of the number is determined when the program is executed, how to solve it?

Answer 3

[Walter Roberson]

In the case where you want a bunch of values to all come out the same length, then

cellstr(num2str(TheValues(:)))

You can also toss in an optional format such as

cellstr(num2str(TheValues(:), '%.2f'))

Example:

cellstr(num2str((1:31).'))