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#!/usr/local/bin/perl
# ********************************************************************
# * Copyright (C) 2016 and later: Unicode, Inc. and others.
# * License & terms of use: http://www.unicode.org/copyright.html
# ********************************************************************
# ********************************************************************
# * COPYRIGHT:
# * Copyright (c) 2002, International Business Machines Corporation and
# * others. All Rights Reserved.
# ********************************************************************
my $PLUS_MINUS = "±";
#|#---------------------------------------------------------------------
#|# Format a confidence interval, as given by a Dataset. Output is as
#|# as follows:
#|# 241.23 - 241.98 => 241.5 +/- 0.3
#|# 241.2 - 243.8 => 242 +/- 1
#|# 211.0 - 241.0 => 226 +/- 15 or? 230 +/- 20
#|# 220.3 - 234.3 => 227 +/- 7
#|# 220.3 - 300.3 => 260 +/- 40
#|# 220.3 - 1000 => 610 +/- 390 or? 600 +/- 400
#|# 0.022 - 0.024 => 0.023 +/- 0.001
#|# 0.022 - 0.032 => 0.027 +/- 0.005
#|# 0.022 - 1.000 => 0.5 +/- 0.5
#|# In other words, take one significant digit of the error value and
#|# display the mean to the same precision.
#|sub formatDataset {
#| my $ds = shift;
#| my $lower = $ds->getMean() - $ds->getError();
#| my $upper = $ds->getMean() + $ds->getError();
#| my $scale = 0;
#| # Find how many initial digits are the same
#| while ($lower < 1 ||
#| int($lower) == int($upper)) {
#| $lower *= 10;
#| $upper *= 10;
#| $scale++;
#| }
#| while ($lower >= 10 &&
#| int($lower) == int($upper)) {
#| $lower /= 10;
#| $upper /= 10;
#| $scale--;
#| }
#|}
#---------------------------------------------------------------------
# Format a number, optionally with a +/- delta, to n significant
# digits.
#
# @param significant digit, a value >= 1
# @param multiplier
# @param time in seconds to be formatted
# @optional delta in seconds
#
# @return string of the form "23" or "23 +/- 10".
#
sub formatNumber {
my $sigdig = shift;
my $mult = shift;
my $a = shift;
my $delta = shift; # may be undef
my $result = formatSigDig($sigdig, $a*$mult);
if (defined($delta)) {
my $d = formatSigDig($sigdig, $delta*$mult);
# restrict PRECISION of delta to that of main number
if ($result =~ /\.(\d+)/) {
# TODO make this work for values with all significant
# digits to the left of the decimal, e.g., 1234000.
# TODO the other thing wrong with this is that it
# isn't rounding the $delta properly. Have to put
# this logic into formatSigDig().
my $x = length($1);
$d =~ s/\.(\d{$x})\d+/.$1/;
}
$result .= " $PLUS_MINUS " . $d;
}
$result;
}
#---------------------------------------------------------------------
# Format a time, optionally with a +/- delta, to n significant
# digits.
#
# @param significant digit, a value >= 1
# @param time in seconds to be formatted
# @optional delta in seconds
#
# @return string of the form "23 ms" or "23 +/- 10 ms".
#
sub formatSeconds {
my $sigdig = shift;
my $a = shift;
my $delta = shift; # may be undef
my @MULT = (1 , 1e3, 1e6, 1e9);
my @SUFF = ('s' , 'ms', 'us', 'ns');
# Determine our scale
my $i = 0;
#always do seconds if the following line is commented out
++$i while ($a*$MULT[$i] < 1 && $i < @MULT);
formatNumber($sigdig, $MULT[$i], $a, $delta) . ' ' . $SUFF[$i];
}
#---------------------------------------------------------------------
# Format a percentage, optionally with a +/- delta, to n significant
# digits.
#
# @param significant digit, a value >= 1
# @param value to be formatted, as a fraction, e.g. 0.5 for 50%
# @optional delta, as a fraction
#
# @return string of the form "23 %" or "23 +/- 10 %".
#
sub formatPercent {
my $sigdig = shift;
my $a = shift;
my $delta = shift; # may be undef
formatNumber($sigdig, 100, $a, $delta) . '%';
}
#---------------------------------------------------------------------
# Format a number to n significant digits without using exponential
# notation.
#
# @param significant digit, a value >= 1
# @param number to be formatted
#
# @return string of the form "1234" "12.34" or "0.001234". If
# number was negative, prefixed by '-'.
#
sub formatSigDig {
my $n = shift() - 1;
my $a = shift;
local $_ = sprintf("%.${n}e", $a);
my $sign = (s/^-//) ? '-' : '';
my $a_e;
my $result;
if (/^(\d)\.(\d+)e([-+]\d+)$/) {
my ($d, $dn, $e) = ($1, $2, $3);
$a_e = $e;
$d .= $dn;
$e++;
$d .= '0' while ($e > length($d));
while ($e < 1) {
$e++;
$d = '0' . $d;
}
if ($e == length($d)) {
$result = $sign . $d;
} else {
$result = $sign . substr($d, 0, $e) . '.' . substr($d, $e);
}
} else {
die "Can't parse $_";
}
$result;
}
1;
#eof
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