phpexcel_roundsigfig.patch

From 75eddb8e0c324b50f53e3f4cb2075407cab6ca32 Mon Sep 17 00:00:00 2001
From: Steve Henshaw <steve.henshaw@learnsci.co.uk>
Date: Wed, 19 Nov 2014 14:50:20 +0000
Subject: [PATCH] added the ROUNDSIGFIG function

---
 phpexcel/PHPExcel/Calculation.php          |  4 ++++
 phpexcel/PHPExcel/Calculation/MathTrig.php | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/phpexcel/PHPExcel/Calculation.php b/phpexcel/PHPExcel/Calculation.php
index 6159be9..48b74c9 100644
--- a/phpexcel/PHPExcel/Calculation.php
+++ b/phpexcel/PHPExcel/Calculation.php
@@ -1400,6 +1400,10 @@ class PHPExcel_Calculation {
 												 'functionCall'		=>	'PHPExcel_Calculation_MathTrig::ROUNDUP',
 												 'argumentCount'	=>	'2'
 												),
+				'ROUNDSIGFIG'		=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_MATH_AND_TRIG,
+												 'functionCall'		=>	'PHPExcel_Calculation_MathTrig::ROUNDSIGFIG',
+												 'argumentCount'	=>	'2'
+												),
 				'ROW'					=> array('category'			=>	PHPExcel_Calculation_Function::CATEGORY_LOOKUP_AND_REFERENCE,
 												 'functionCall'		=>	'PHPExcel_Calculation_LookupRef::ROW',
 												 'argumentCount'	=>	'-1',
diff --git a/phpexcel/PHPExcel/Calculation/MathTrig.php b/phpexcel/PHPExcel/Calculation/MathTrig.php
index b2bb19d..c5b284e 100644
--- a/phpexcel/PHPExcel/Calculation/MathTrig.php
+++ b/phpexcel/PHPExcel/Calculation/MathTrig.php
@@ -965,6 +965,24 @@ class PHPExcel_Calculation_MathTrig {
 		return PHPExcel_Calculation_Functions::VALUE();
 	}	//	function ROUNDDOWN()
 
+  /**
+	 *	ROUNDSIGFIG
+	 *
+	 *	Rounds a number up to a specified number of decimal places
+	 *
+	 *	@param	float	$number			Number to round
+	 *	@param	int		$digits			Number of sig figs to which you want to round $number
+	 *	@return	float	Rounded Number to sig figs
+	 */
+	public static function ROUNDSIGFIG($number,$sigfig) {
+		$number	= PHPExcel_Calculation_Functions::flattenSingleValue($number);
+		$sigfig	= PHPExcel_Calculation_Functions::flattenSingleValue($sigfig);
+
+		if ((is_numeric($number)) && (is_numeric($sigfig))) {
+			return round($number,($sigfig-1-PHPExcel_Calculation_MathTrig::INT(self::LOG_BASE(abs($number), 10))));
+		}
+		return PHPExcel_Calculation_Functions::VALUE();
+	}	//	function ROUNDSIGFIG()
 
 	/**
 	 * SERIESSUM
-- 
1.9.1