This?


  DB<54> $b=3.1565323

  DB<55> $a=3.1566789

  DB<56> p abs(1e5*($b-$a)) <1

  DB<57> p abs(1e5*($b-$a))
14.660000000033
  DB<58>

[download]

of course you could avoid the multiplication by providing an accurate threshold smaller than 1.

It'll become more complicated with two coordinates, than I'd say Pythagoras is accurate enough°

edit

Pythagoras sqr( d_x ** 2 + d_y ** 2 ) with d_ for delta= abs(c0-c1)

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

°) even for spherical coordinates of that size (but don't use this for the distance between New York and Seattle, you might fall off the edge of the world)

In reply to Re: Check whether two numbers are within a range by LanX
in thread Check whether two numbers are within a range by stevieb

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