Your IP : 216.73.216.164
<?php
/**
* Created by: Jon Lawrence on 2015-07-13 8:42 AM
*/
namespace jlawrence\eos;
class AdvancedFunctions
{
/**
* Create a list for the parser of 'expressiveFunction' => 'class::function'
*
* @return array
*/
public static function map()
{
$ret = array(
'sum' => __NAMESPACE__ .'\AdvancedFunctions::sum',
'log' => __NAMESPACE__ .'\AdvancedFunctions::log'
);
return $ret;
}
/**
* Summation function
*
* Will take an equation and run it through a summation algorithm. All parts
* of the input can be in equation form, so the start and stops can have
* equations to determine what they should be using the globally inputted
* variables from the user.
*
* @param string $input String in the form of "equation, start, stop"
* @param array $vars Array of variables used for solving the current equation.
* @return float The summation of the equation
*/
public static function sum($input, $vars)
{
//remove whitespace
$input = preg_replace("/\s/", "", $input);
//split in to parts
list($eq, $start, $stop) = explode(",", $input);
$ret = 0;
//make sure there's a variable, or return equation as-is
if((Parser::solveIF($eq,0)) == preg_replace("/[\(\)]/", "", $eq)) {
return $eq;
}
$start = Parser::solveIF($start, $vars);
$stop = Parser::solveIF($stop, $vars);
for($i=$start; $i <= $stop; $i++) {
$ret += Parser::solveIF($eq, $i);
}
return $ret;
}
/**
* Log function for all non-natural logs. Defaults to base 10
*
* @param $input
* @param array $vars Variable replacement
* @return float
* @throws \Exception
*/
public static function log($input, $vars)
{
$base = 10;
if(stripos($input, ",")) {
list($eq, $base) = explode(",", $input);
} else {
$eq = $input;
}
//Make sure no functions or operators are hidden inside
$sc = Parser::solveIF($eq, $vars);
if(10 != $base) {
$base = Parser::solveIF($base, $vars);
}
$ans = log($sc, $base);
if(is_nan($ans) || is_infinite($ans)) {
throw new \Exception("Result of 'log({$eq}, {$base}) = {$ans}' is either infinite or a non-number in ". Parser::$inFix, Math::E_NAN);
}
return $ans;
}
}