Re: Problem with calculate

Thanks ! abs() will not work for me, because I may have na negative numbers, but with round() it worked ! 10x "John W. Holmes" <holmes072000@charter.net> wrote in message news:40F83F0A.6000501@charter.net... > Rosen wrote: > > > I use some numbers from mysql table and other local vars to calculate one > > number. > > But on one calc I receive thath $value=4.5474735088646E-013; > > This must be zero (0) - I see all vars and calc then with calculator. I use > > function number_format($value, 2, ".", "" ) and it return me -0.00 > > When you use floating point numbers, you can get small errors like this. > To the computer, 4.54E-13 is about the same as zero. number_format() > returns the correct result... well, the negative sign may throw you off. > You can use abs() and round() to get what you want, more than likely. > > The thing to remember and react accordingly to is that for floating > point numbers, 2.0 - 1.5 can equal 0.4999999999999999 and be "correct" > because of the precision. > > -- > ---John Holmes... > > Amazon Wishlist: www.amazon.com/o/registry/3BEXC84AB3A5E/ > > php|architect: The Magazine for PHP Professionals – www.phparch.com