Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

Re: Check whether two numbers are within a range

by LanX (Saint)
on Feb 26, 2021 at 16:29 UTC ( [id://11128844]=note: print w/replies, xml ) Need Help??


in reply to Check whether two numbers are within a range

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)

Replies are listed 'Best First'.
Re^2: Check whether two numbers are within a range
by stevieb (Canon) on Feb 26, 2021 at 16:56 UTC

    Thank you. This works well, regardless if the vehicle's actual location will be plus or minus the pre-determined coordinates I'll be comparing against.

    Mock up:

    use warnings;
use strict;
use feature 'say';

use constant {
    ACCURACY    => 1e5,
    RANGE       => 1.2,
    LON         => -119.31665,
};

my $lon_current = -119.31666;

my $deviation = abs(ACCURACY * (LON - $lon_current));

say "Within range: $deviation" if $deviation < RANGE;

    [download]
[reply]
[d/l]
      I hope you are not only testing the longitude but also the latitude.

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

[reply]

In Section Seekers of Perl Wisdom

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?

www.com | www.net | www.org
Node Status?
node history
Node Type: note [id://11128844]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? • Last hour • Other CB clients
Other Users?
Others admiring the Monastery: (2)
As of 2024-04-20 05:43 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found