summaryrefslogtreecommitdiff
path: root/html/jpgraph/jpgraph_utils.inc.php
diff options
context:
space:
mode:
Diffstat (limited to 'html/jpgraph/jpgraph_utils.inc.php')
-rw-r--r--html/jpgraph/jpgraph_utils.inc.php685
1 files changed, 685 insertions, 0 deletions
diff --git a/html/jpgraph/jpgraph_utils.inc.php b/html/jpgraph/jpgraph_utils.inc.php
new file mode 100644
index 0000000..f0d002c
--- /dev/null
+++ b/html/jpgraph/jpgraph_utils.inc.php
@@ -0,0 +1,685 @@
+<?php
+/*=======================================================================
+ // File: JPGRAPH_UTILS.INC
+ // Description: Collection of non-essential "nice to have" utilities
+ // Created: 2005-11-20
+ // Ver: $Id: jpgraph_utils.inc.php 1777 2009-08-23 17:34:36Z ljp $
+ //
+ // Copyright (c) Asial Corporation. All rights reserved.
+ //========================================================================
+ */
+
+//===================================================
+// CLASS FuncGenerator
+// Description: Utility class to help generate data for function plots.
+// The class supports both parametric and regular functions.
+//===================================================
+class FuncGenerator {
+ private $iFunc='',$iXFunc='',$iMin,$iMax,$iStepSize;
+
+ function __construct($aFunc,$aXFunc='') {
+ $this->iFunc = $aFunc;
+ $this->iXFunc = $aXFunc;
+ }
+
+ function E($aXMin,$aXMax,$aSteps=50) {
+ $this->iMin = $aXMin;
+ $this->iMax = $aXMax;
+ $this->iStepSize = ($aXMax-$aXMin)/$aSteps;
+
+ if( $this->iXFunc != '' )
+ $t = 'for($i='.$aXMin.'; $i<='.$aXMax.'; $i += '.$this->iStepSize.') {$ya[]='.$this->iFunc.';$xa[]='.$this->iXFunc.';}';
+ elseif( $this->iFunc != '' )
+ $t = 'for($x='.$aXMin.'; $x<='.$aXMax.'; $x += '.$this->iStepSize.') {$ya[]='.$this->iFunc.';$xa[]=$x;} $x='.$aXMax.';$ya[]='.$this->iFunc.';$xa[]=$x;';
+ else
+ JpGraphError::RaiseL(24001);//('FuncGenerator : No function specified. ');
+
+ @eval($t);
+
+ // If there is an error in the function specifcation this is the only
+ // way we can discover that.
+ if( empty($xa) || empty($ya) )
+ JpGraphError::RaiseL(24002);//('FuncGenerator : Syntax error in function specification ');
+
+ return array($xa,$ya);
+ }
+}
+
+
+//=============================================================================
+// CLASS DateScaleUtils
+// Description: Help to create a manual date scale
+//=============================================================================
+define('DSUTILS_MONTH',1); // Major and minor ticks on a monthly basis
+define('DSUTILS_MONTH1',1); // Major and minor ticks on a monthly basis
+define('DSUTILS_MONTH2',2); // Major ticks on a bi-monthly basis
+define('DSUTILS_MONTH3',3); // Major icks on a tri-monthly basis
+define('DSUTILS_MONTH6',4); // Major on a six-monthly basis
+define('DSUTILS_WEEK1',5); // Major ticks on a weekly basis
+define('DSUTILS_WEEK2',6); // Major ticks on a bi-weekly basis
+define('DSUTILS_WEEK4',7); // Major ticks on a quod-weekly basis
+define('DSUTILS_DAY1',8); // Major ticks on a daily basis
+define('DSUTILS_DAY2',9); // Major ticks on a bi-daily basis
+define('DSUTILS_DAY4',10); // Major ticks on a qoud-daily basis
+define('DSUTILS_YEAR1',11); // Major ticks on a yearly basis
+define('DSUTILS_YEAR2',12); // Major ticks on a bi-yearly basis
+define('DSUTILS_YEAR5',13); // Major ticks on a five-yearly basis
+
+
+class DateScaleUtils {
+ public static $iMin=0, $iMax=0;
+
+ private static $starthour,$startmonth, $startday, $startyear;
+ private static $endmonth, $endyear, $endday;
+ private static $tickPositions=array(),$minTickPositions=array();
+ private static $iUseWeeks = true;
+
+ static function UseWeekFormat($aFlg) {
+ self::$iUseWeeks = $aFlg;
+ }
+
+ static function doYearly($aType,$aMinor=false) {
+ $i=0; $j=0;
+ $m = self::$startmonth;
+ $y = self::$startyear;
+
+ if( self::$startday == 1 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y);
+ }
+ ++$m;
+
+
+ switch( $aType ) {
+ case DSUTILS_YEAR1:
+ for($y=self::$startyear; $y <= self::$endyear; ++$y ) {
+ if( $aMinor ) {
+ while( $m <= 12 ) {
+ if( !($y == self::$endyear && $m > self::$endmonth) ) {
+ self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y);
+ }
+ ++$m;
+ }
+ $m=1;
+ }
+ self::$tickPositions[$i++] = mktime(0,0,0,1,1,$y);
+ }
+ break;
+ case DSUTILS_YEAR2:
+ $y=self::$startyear;
+ while( $y <= self::$endyear ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,1,1,$y);
+ for($k=0; $k < 1; ++$k ) {
+ ++$y;
+ if( $aMinor ) {
+ self::$minTickPositions[$j++] = mktime(0,0,0,1,1,$y);
+ }
+ }
+ ++$y;
+ }
+ break;
+ case DSUTILS_YEAR5:
+ $y=self::$startyear;
+ while( $y <= self::$endyear ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,1,1,$y);
+ for($k=0; $k < 4; ++$k ) {
+ ++$y;
+ if( $aMinor ) {
+ self::$minTickPositions[$j++] = mktime(0,0,0,1,1,$y);
+ }
+ }
+ ++$y;
+ }
+ break;
+ }
+ }
+
+ static function doDaily($aType,$aMinor=false) {
+ $m = self::$startmonth;
+ $y = self::$startyear;
+ $d = self::$startday;
+ $h = self::$starthour;
+ $i=0;$j=0;
+
+ if( $h == 0 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,$d,$y);
+ }
+ $t = mktime(0,0,0,$m,$d,$y);
+
+ switch($aType) {
+ case DSUTILS_DAY1:
+ while( $t <= self::$iMax ) {
+ $t = strtotime('+1 day',$t);
+ self::$tickPositions[$i++] = $t;
+ if( $aMinor ) {
+ self::$minTickPositions[$j++] = strtotime('+12 hours',$t);
+ }
+ }
+ break;
+ case DSUTILS_DAY2:
+ while( $t <= self::$iMax ) {
+ $t = strtotime('+1 day',$t);
+ if( $aMinor ) {
+ self::$minTickPositions[$j++] = $t;
+ }
+ $t = strtotime('+1 day',$t);
+ self::$tickPositions[$i++] = $t;
+ }
+ break;
+ case DSUTILS_DAY4:
+ while( $t <= self::$iMax ) {
+ for($k=0; $k < 3; ++$k ) {
+ $t = strtotime('+1 day',$t);
+ if( $aMinor ) {
+ self::$minTickPositions[$j++] = $t;
+ }
+ }
+ $t = strtotime('+1 day',$t);
+ self::$tickPositions[$i++] = $t;
+ }
+ break;
+ }
+ }
+
+ static function doWeekly($aType,$aMinor=false) {
+ $hpd = 3600*24;
+ $hpw = 3600*24*7;
+ // Find out week number of min date
+ $thursday = self::$iMin + $hpd * (3 - (date('w', self::$iMin) + 6) % 7);
+ $week = 1 + (date('z', $thursday) - (11 - date('w', mktime(0, 0, 0, 1, 1, date('Y', $thursday)))) % 7) / 7;
+ $daynumber = date('w',self::$iMin);
+ if( $daynumber == 0 ) $daynumber = 7;
+ $m = self::$startmonth;
+ $y = self::$startyear;
+ $d = self::$startday;
+ $i=0;$j=0;
+ // The assumption is that the weeks start on Monday. If the first day
+ // is later in the week then the first week tick has to be on the following
+ // week.
+ if( $daynumber == 1 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,$d,$y);
+ $t = mktime(0,0,0,$m,$d,$y) + $hpw;
+ }
+ else {
+ $t = mktime(0,0,0,$m,$d,$y) + $hpd*(8-$daynumber);
+ }
+
+ switch($aType) {
+ case DSUTILS_WEEK1:
+ $cnt=0;
+ break;
+ case DSUTILS_WEEK2:
+ $cnt=1;
+ break;
+ case DSUTILS_WEEK4:
+ $cnt=3;
+ break;
+ }
+ while( $t <= self::$iMax ) {
+ self::$tickPositions[$i++] = $t;
+ for($k=0; $k < $cnt; ++$k ) {
+ $t += $hpw;
+ if( $aMinor ) {
+ self::$minTickPositions[$j++] = $t;
+ }
+ }
+ $t += $hpw;
+ }
+ }
+
+ static function doMonthly($aType,$aMinor=false) {
+ $monthcount=0;
+ $m = self::$startmonth;
+ $y = self::$startyear;
+ $i=0; $j=0;
+
+ // Skip the first month label if it is before the startdate
+ if( self::$startday == 1 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y);
+ $monthcount=1;
+ }
+ if( $aType == 1 ) {
+ if( self::$startday < 15 ) {
+ self::$minTickPositions[$j++] = mktime(0,0,0,$m,15,$y);
+ }
+ }
+ ++$m;
+
+ // Loop through all the years included in the scale
+ for($y=self::$startyear; $y <= self::$endyear; ++$y ) {
+ // Loop through all the months. There are three cases to consider:
+ // 1. We are in the first year and must start with the startmonth
+ // 2. We are in the end year and we must stop at last month of the scale
+ // 3. A year in between where we run through all the 12 months
+ $stopmonth = $y == self::$endyear ? self::$endmonth : 12;
+ while( $m <= $stopmonth ) {
+ switch( $aType ) {
+ case DSUTILS_MONTH1:
+ // Set minor tick at the middle of the month
+ if( $aMinor ) {
+ if( $m <= $stopmonth ) {
+ if( !($y==self::$endyear && $m==$stopmonth && self::$endday < 15) )
+ self::$minTickPositions[$j++] = mktime(0,0,0,$m,15,$y);
+ }
+ }
+ // Major at month
+ // Get timestamp of first hour of first day in each month
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y);
+
+ break;
+ case DSUTILS_MONTH2:
+ if( $aMinor ) {
+ // Set minor tick at start of each month
+ self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y);
+ }
+
+ // Major at every second month
+ // Get timestamp of first hour of first day in each month
+ if( $monthcount % 2 == 0 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y);
+ }
+ break;
+ case DSUTILS_MONTH3:
+ if( $aMinor ) {
+ // Set minor tick at start of each month
+ self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y);
+ }
+ // Major at every third month
+ // Get timestamp of first hour of first day in each month
+ if( $monthcount % 3 == 0 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y);
+ }
+ break;
+ case DSUTILS_MONTH6:
+ if( $aMinor ) {
+ // Set minor tick at start of each month
+ self::$minTickPositions[$j++] = mktime(0,0,0,$m,1,$y);
+ }
+ // Major at every third month
+ // Get timestamp of first hour of first day in each month
+ if( $monthcount % 6 == 0 ) {
+ self::$tickPositions[$i++] = mktime(0,0,0,$m,1,$y);
+ }
+ break;
+ }
+ ++$m;
+ ++$monthcount;
+ }
+ $m=1;
+ }
+
+ // For the case where all dates are within the same month
+ // we want to make sure we have at least two ticks on the scale
+ // since the scale want work properly otherwise
+ if(self::$startmonth == self::$endmonth && self::$startyear == self::$endyear && $aType==1 ) {
+ self::$tickPositions[$i++] = mktime(0 ,0 ,0, self::$startmonth + 1, 1, self::$startyear);
+ }
+
+ return array(self::$tickPositions,self::$minTickPositions);
+ }
+
+ static function GetTicks($aData,$aType=1,$aMinor=false,$aEndPoints=false) {
+ $n = count($aData);
+ return self::GetTicksFromMinMax($aData[0],$aData[$n-1],$aType,$aMinor,$aEndPoints);
+ }
+
+ static function GetAutoTicks($aMin,$aMax,$aMaxTicks=10,$aMinor=false) {
+ $diff = $aMax - $aMin;
+ $spd = 3600*24;
+ $spw = $spd*7;
+ $spm = $spd*30;
+ $spy = $spd*352;
+
+ if( self::$iUseWeeks )
+ $w = 'W';
+ else
+ $w = 'd M';
+
+ // Decision table for suitable scales
+ // First value: Main decision point
+ // Second value: Array of formatting depending on divisor for wanted max number of ticks. <divisor><formatting><format-string>,..
+ $tt = array(
+ array($spw, array(1,DSUTILS_DAY1,'d M',2,DSUTILS_DAY2,'d M',-1,DSUTILS_DAY4,'d M')),
+ array($spm, array(1,DSUTILS_DAY1,'d M',2,DSUTILS_DAY2,'d M',4,DSUTILS_DAY4,'d M',7,DSUTILS_WEEK1,$w,-1,DSUTILS_WEEK2,$w)),
+ array($spy, array(1,DSUTILS_DAY1,'d M',2,DSUTILS_DAY2,'d M',4,DSUTILS_DAY4,'d M',7,DSUTILS_WEEK1,$w,14,DSUTILS_WEEK2,$w,30,DSUTILS_MONTH1,'M',60,DSUTILS_MONTH2,'M',-1,DSUTILS_MONTH3,'M')),
+ array(-1, array(30,DSUTILS_MONTH1,'M-Y',60,DSUTILS_MONTH2,'M-Y',90,DSUTILS_MONTH3,'M-Y',180,DSUTILS_MONTH6,'M-Y',352,DSUTILS_YEAR1,'Y',704,DSUTILS_YEAR2,'Y',-1,DSUTILS_YEAR5,'Y')));
+
+ $ntt = count($tt);
+ $nd = floor($diff/$spd);
+ for($i=0; $i < $ntt; ++$i ) {
+ if( $diff <= $tt[$i][0] || $i==$ntt-1) {
+ $t = $tt[$i][1];
+ $n = count($t)/3;
+ for( $j=0; $j < $n; ++$j ) {
+ if( $nd/$t[3*$j] <= $aMaxTicks || $j==$n-1) {
+ $type = $t[3*$j+1];
+ $fs = $t[3*$j+2];
+ list($tickPositions,$minTickPositions) = self::GetTicksFromMinMax($aMin,$aMax,$type,$aMinor);
+ return array($fs,$tickPositions,$minTickPositions,$type);
+ }
+ }
+ }
+ }
+ }
+
+ static function GetTicksFromMinMax($aMin,$aMax,$aType,$aMinor=false,$aEndPoints=false) {
+ self::$starthour = date('G',$aMin);
+ self::$startmonth = date('n',$aMin);
+ self::$startday = date('j',$aMin);
+ self::$startyear = date('Y',$aMin);
+ self::$endmonth = date('n',$aMax);
+ self::$endyear = date('Y',$aMax);
+ self::$endday = date('j',$aMax);
+ self::$iMin = $aMin;
+ self::$iMax = $aMax;
+
+ if( $aType <= DSUTILS_MONTH6 ) {
+ self::doMonthly($aType,$aMinor);
+ }
+ elseif( $aType <= DSUTILS_WEEK4 ) {
+ self::doWeekly($aType,$aMinor);
+ }
+ elseif( $aType <= DSUTILS_DAY4 ) {
+ self::doDaily($aType,$aMinor);
+ }
+ elseif( $aType <= DSUTILS_YEAR5 ) {
+ self::doYearly($aType,$aMinor);
+ }
+ else {
+ JpGraphError::RaiseL(24003);
+ }
+ // put a label at the very left data pos
+ if( $aEndPoints ) {
+ $tickPositions[$i++] = $aData[0];
+ }
+
+ // put a label at the very right data pos
+ if( $aEndPoints ) {
+ $tickPositions[$i] = $aData[$n-1];
+ }
+
+ return array(self::$tickPositions,self::$minTickPositions);
+ }
+}
+
+//=============================================================================
+// Class ReadFileData
+//=============================================================================
+Class ReadFileData {
+ //----------------------------------------------------------------------------
+ // Desciption:
+ // Read numeric data from a file.
+ // Each value should be separated by either a new line or by a specified
+ // separator character (default is ',').
+ // Before returning the data each value is converted to a proper float
+ // value. The routine is robust in the sense that non numeric data in the
+ // file will be discarded.
+ //
+ // Returns:
+ // The number of data values read on success, FALSE on failure
+ //----------------------------------------------------------------------------
+ static function FromCSV($aFile,&$aData,$aSepChar=',',$aMaxLineLength=1024) {
+ $rh = @fopen($aFile,'r');
+ if( $rh === false ) {
+ return false;
+ }
+ $tmp = array();
+ $lineofdata = fgetcsv($rh, 1000, ',');
+ while ( $lineofdata !== FALSE) {
+ $tmp = array_merge($tmp,$lineofdata);
+ $lineofdata = fgetcsv($rh, $aMaxLineLength, $aSepChar);
+ }
+ fclose($rh);
+
+ // Now make sure that all data is numeric. By default
+ // all data is read as strings
+ $n = count($tmp);
+ $aData = array();
+ $cnt=0;
+ for($i=0; $i < $n; ++$i) {
+ if( $tmp[$i] !== "" ) {
+ $aData[$cnt++] = floatval($tmp[$i]);
+ }
+ }
+ return $cnt;
+ }
+
+ //----------------------------------------------------------------------------
+ // Desciption:
+ // Read numeric data from a file.
+ // Each value should be separated by either a new line or by a specified
+ // separator character (default is ',').
+ // Before returning the data each value is converted to a proper float
+ // value. The routine is robust in the sense that non numeric data in the
+ // file will be discarded.
+ //
+ // Options:
+ // 'separator' => ',',
+ // 'enclosure' => '"',
+ // 'readlength' => 1024,
+ // 'ignore_first' => false,
+ // 'first_as_key' => false
+ // 'escape' => '\', # PHP >= 5.3 only
+ //
+ // Returns:
+ // The number of lines read on success, FALSE on failure
+ //----------------------------------------------------------------------------
+ static function FromCSV2($aFile, &$aData, $aOptions = array()) {
+ $aDefaults = array(
+ 'separator' => ',',
+ 'enclosure' => chr(34),
+ 'escape' => chr(92),
+ 'readlength' => 1024,
+ 'ignore_first' => false,
+ 'first_as_key' => false
+ );
+
+ $aOptions = array_merge(
+ $aDefaults, is_array($aOptions) ? $aOptions : array());
+
+ if( $aOptions['first_as_key'] ) {
+ $aOptions['ignore_first'] = true;
+ }
+
+ $rh = @fopen($aFile, 'r');
+
+ if( $rh === false ) {
+ return false;
+ }
+
+ $aData = array();
+ $aLine = fgetcsv($rh,
+ $aOptions['readlength'],
+ $aOptions['separator'],
+ $aOptions['enclosure']
+ /*, $aOptions['escape'] # PHP >= 5.3 only */
+ );
+
+ // Use numeric array keys for the columns by default
+ // If specified use first lines values as assoc keys instead
+ $keys = array_keys($aLine);
+ if( $aOptions['first_as_key'] ) {
+ $keys = array_values($aLine);
+ }
+
+ $num_lines = 0;
+ $num_cols = count($aLine);
+
+ while ($aLine !== false) {
+ if( is_array($aLine) && count($aLine) != $num_cols ) {
+ JpGraphError::RaiseL(24004);
+ // 'ReadCSV2: Column count mismatch in %s line %d'
+ }
+
+ // fgetcsv returns NULL for empty lines
+ if( !is_null($aLine) ) {
+ $num_lines++;
+
+ if( !($aOptions['ignore_first'] && $num_lines == 1) && is_numeric($aLine[0]) ) {
+ for( $i = 0; $i < $num_cols; $i++ ) {
+ $aData[ $keys[$i] ][] = floatval($aLine[$i]);
+ }
+ }
+ }
+
+ $aLine = fgetcsv($rh,
+ $aOptions['readlength'],
+ $aOptions['separator'],
+ $aOptions['enclosure']
+ /*, $aOptions['escape'] # PHP >= 5.3 only*/
+ );
+ }
+
+ fclose($rh);
+
+ if( $aOptions['ignore_first'] ) {
+ $num_lines--;
+ }
+
+ return $num_lines;
+ }
+
+ // Read data from two columns in a plain text file
+ static function From2Col($aFile, $aCol1, $aCol2, $aSepChar=' ') {
+ $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
+ if( $lines === false ) {
+ return false;
+ }
+ $s = '/[\s]+/';
+ if( $aSepChar == ',' ) {
+ $s = '/[\s]*,[\s]*/';
+ }
+ elseif( $aSepChar == ';' ) {
+ $s = '/[\s]*;[\s]*/';
+ }
+ foreach( $lines as $line => $datarow ) {
+ $split = preg_split($s,$datarow);
+ $aCol1[] = floatval(trim($split[0]));
+ $aCol2[] = floatval(trim($split[1]));
+ }
+
+ return count($lines);
+ }
+
+ // Read data from one columns in a plain text file
+ static function From1Col($aFile, $aCol1) {
+ $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
+ if( $lines === false ) {
+ return false;
+ }
+ foreach( $lines as $line => $datarow ) {
+ $aCol1[] = floatval(trim($datarow));
+ }
+
+ return count($lines);
+ }
+
+ static function FromMatrix($aFile,$aSepChar=' ') {
+ $lines = @file($aFile,FILE_IGNORE_NEW_LINES|FILE_SKIP_EMPTY_LINES);
+ if( $lines === false ) {
+ return false;
+ }
+ $mat = array();
+ $reg = '/'.$aSepChar.'/';
+ foreach( $lines as $line => $datarow ) {
+ $row = preg_split($reg,trim($datarow));
+ foreach ($row as $key => $cell ) {
+ $row[$key] = floatval(trim($cell));
+ }
+ $mat[] = $row;
+ }
+ return $mat;
+ }
+
+
+}
+
+define('__LR_EPSILON', 1.0e-8);
+//=============================================================================
+// Class LinearRegression
+//=============================================================================
+class LinearRegression {
+ private $ix=array(),$iy=array();
+ private $ib=0, $ia=0;
+ private $icalculated=false;
+ public $iDet=0, $iCorr=0, $iStdErr=0;
+
+ public function __construct($aDataX,$aDataY) {
+ if( count($aDataX) !== count($aDataY) ) {
+ JpGraph::Raise('LinearRegression: X and Y data array must be of equal length.');
+ }
+ $this->ix = $aDataX;
+ $this->iy = $aDataY;
+ }
+
+ public function Calc() {
+
+ $this->icalculated = true;
+
+ $n = count($this->ix);
+ $sx2 = 0 ;
+ $sy2 = 0 ;
+ $sxy = 0 ;
+ $sx = 0 ;
+ $sy = 0 ;
+
+ for( $i=0; $i < $n; ++$i ) {
+ $sx2 += $this->ix[$i] * $this->ix[$i];
+ $sy2 += $this->iy[$i] * $this->iy[$i];
+ $sxy += $this->ix[$i] * $this->iy[$i];
+ $sx += $this->ix[$i];
+ $sy += $this->iy[$i];
+ }
+
+ if( $n*$sx2 - $sx*$sx > __LR_EPSILON ) {
+ $this->ib = ($n*$sxy - $sx*$sy) / ( $n*$sx2 - $sx*$sx );
+ $this->ia = ( $sy - $this->ib*$sx ) / $n;
+
+ $sx = $this->ib * ( $sxy - $sx*$sy/$n );
+ $sy2 = $sy2 - $sy*$sy/$n;
+ $sy = $sy2 - $sx;
+
+ $this->iDet = $sx / $sy2;
+ $this->iCorr = sqrt($this->iDet);
+ if( $n > 2 ) {
+ $this->iStdErr = sqrt( $sy / ($n-2) );
+ }
+ else {
+ $this->iStdErr = NAN ;
+ }
+ }
+ else {
+ $this->ib = 0;
+ $this->ia = 0;
+ }
+
+ }
+
+ public function GetAB() {
+ if( $this->icalculated == false )
+ $this->Calc();
+ return array($this->ia, $this->ib);
+ }
+
+ public function GetStat() {
+ if( $this->icalculated == false )
+ $this->Calc();
+ return array($this->iStdErr, $this->iCorr, $this->iDet);
+ }
+
+ public function GetY($aMinX, $aMaxX, $aStep=1) {
+ if( $this->icalculated == false )
+ $this->Calc();
+
+ $yy = array();
+ $i = 0;
+ for( $x=$aMinX; $x <= $aMaxX; $x += $aStep ) {
+ $xx[$i ] = $x;
+ $yy[$i++] = $this->ia + $this->ib * $x;
+ }
+
+ return array($xx,$yy);
+ }
+
+}
+
+?>
generated by cgit (git 2.34.1) at 2025-06-15 22:04:32 +0000