Re^2: sub as mathematical function

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Re^3: sub as mathematical function by LanX (Saint) on Sep 04, 2019 at 13:08 UTC
Oh ... off by max, again! ;-) update I wouldn't count on correct input though, and additional max seems safe `DB<5> print $_,":",max(min(int(9*$_/18),8),0),"\n" for -2..20 -2:0 -1:0 0:0 1:0 2:1 3:1 4:2 5:2 6:3 7:3 8:4 9:4 10:5 11:5 12:6 13:6 14:7 15:7 16:8 17:8 18:8 19:8 20:8` [download] Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l]
Re^4: sub as mathematical function by davido (Cardinal) on Sep 04, 2019 at 18:12 UTC
The subexpression 9*X/18 == (9x)/18 == x/2. Therefore, `max(min(int($_ / 2), 8, 0);` Dave	[reply] [d/l]
Re^5: sub as mathematical function by LanX (Saint) on Sep 04, 2019 at 21:15 UTC
The core of the formula was 9*$v I was just trying to cover all edges cases for $v in a one liner. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply]
Re^3: sub as mathematical function by rsFalse (Chaplain) on Sep 04, 2019 at 17:06 UTC
>> min(int(9$x),8)* When number of intervals vary (not only 9), then this looks more general: `my $intervals = 9; min( int( $intervals * $x ), $intervals - 1 )` or: `my $intervals = 9; int( $intervals * $x ) - int $x`	[reply] [d/l] [select]