X-Git-Url: http://git.shiar.nl/sheet.git/blobdiff_plain/0e5d1f97871610a20d556c336b486e0b5a69a9e2..0cb275788053529f8d9948920023198eecddec13:/base.plp

diff --git a/base.plp b/base.plp
index f34f36e..f1ed06c 100644
--- a/base.plp
+++ b/base.plp
@@ -2,7 +2,7 @@
 
 Html({
 	title => 'number bases',
-	version => 'v1.1',
+	version => '1.1',
 	description => [
 		"Cheat sheets summarising various software programs and standards.",
 	],
@@ -13,12 +13,32 @@ Html({
 });
 
 my @cols = (2, 6, 8, 9, 10, 12, 16, 18, 20);
-my @morecols = (2, 3, 4, 6, 8, 9, 10, 12, 16, 18, 20, 24, 32, 36, 64);
+my @morecols = (2 .. 6, 8, 9, 10, 12, 16, 18, 20, 24, 32, 36, 64);
 my @char = (0..9, 'A'..'Z', 'a'..'z');
 :>
 <h1>Number bases</h1>
 
-<h2>Fractions</h2>
+<h2>Radix economy</h2>
+<table>
+<:
+sub radix_economy {
+	my ($val, $radix) = @_;
+	return $radix * int(log($val) / log($radix) + 1);
+}
+
+use List::Util 'sum';
+print '<tr><th>';
+print '<th>', $_ for @morecols;
+for my $max (100, 255, 1024) {
+	print '<tr><th>⍳', $max;
+	for my $radix (@morecols) {
+		printf '<td style="text-align:right">%.1f',
+			sum(map { radix_economy($_, $radix) } 1 .. $max) / $max;
+	}
+}
+:></table>
+
+<h2>Reciprocal fractions (n⁻¹)</h2>
 <table>
 <:
 print '<tr><th>';
@@ -74,10 +94,9 @@ for my $n (2 .. $count) {
 
 <hr>
 
-<h2>Duplication</h2>
+<h2>Duplication (2ⁿ)</h2>
 <table>
 <:
-use 5.010;
 sub showint {
 	my ($int, $radix) = @_;
 	my @digits;