in reply to sub as mathematical function

Yes, see the "modulo" or "remainder" operator.

Replies are listed 'Best First'.
Re^2: sub as mathematical function
by Anonymous Monk on Sep 04, 2019 at 11:34 UTC
    sorry I dont get what you're saying :-( I tried floor(8*$x), round(8*$x), ceil(8*$x) from the POSIX module but their all different from the sub
[reply]
[d/l]
[select]

      I linked to the documentation of the modulo operator. Your subroutine basically seems to do:

      sub mod_9 {
    my( $x ) = @_;
    return $x % 9
}

      [download]

      Update: No, I misread the original function. You seem to input a number with decimals and want to know into which 9-tile it falls. int ($x*9)-1, as LanX notes below, is the correct answer then.

[reply]
[d/l]
[select]

In Section Seekers of Perl Wisdom