How to make num2str output with 4 digits left of decimal? eg 0-> 0000

I am trying to get num2str to fomat its output with 4 digits. For example num2str(0) -> '0000' or num2str(125)-> '0125'

I know that there is a way to do this for digits after the decimal but I'm not sure how to do it for digits before the decimal.

Answer 1

[Aaron Greenbaum]

you can format num2str using the following modifier to get the output I desired. num2str(125, '%04.f') -> '0125'

without the . after the 4 you get 125.0

[Walter Roberson]

Or use '%04d' as the format

Answer 2

[the cyclist]

I suggest that instead you use the sprintf command for this. For example,

sprintf('%04d',125)

or

sprintf('%04d',0)

The formatting specification is pretty versatile, but can take a little while to become facile with.