Sscanf /sprintf usage

Hello,

So, apparently I don't understand very basic I/O....can somebody help me?

if num=343.1; str=sprintf('%10.3f',num); numdata=sscanf(str,'%10.3f'); why does numdata ~= num ???

Now, I can make it work by simply saying: numdata=sscanf(str,'%f'); then numdata=num;

But, I would like to use the former formatted sscanf to check the formatting of an input file...

Answer 1

[Sarah Wait Zaranek]

I think this is your issue --

From doc for sscan - "Format specifiers for the reading functions sscanf and fscanf differ from the formats for the writing functions sprintf and fprintf. The reading functions do not support a precision field. The width field specifies a minimum for writing but a maximum for reading"

This code would work:

num=343.1; 
str=sprintf('%10.3f',num); 
numdata=sscanf(str,'%f');

Answer 2

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F