title: Exception using getCalculatedValue() in phpExcel
body: <p>these are the exception I am getting:</p>
  
  <p>I am getting the following exception:</p>
  
  <p>Uncaught exception 'Exception' with message 'Cyclic Reference in Formula'</p>
  
  <p>I am dealing with a excel sheet which contain very complex calculations. I can not write them all here. I am using an interface to send the values to specific cells of that excel sheet. and then getting back the calculated value from the output cells.</p>
  
  <p>use of getOldCalculatedValue() gets the correct values first Time I use it (I have no idea how)</p>
  
  <p>The problem with getOldCalculatedValue() is that this is not the solution. also when i update my input values , output value does not change.</p>
  
  <p>now i checked deeply.. these are the formulas which are generating exceptions:</p>
  
  <p>Fatal error: Uncaught exception 'Exception' with message 'STEAM!B30 -> STEAM!E57 -> STEAM!B56 -> STEAM!B38 -> STEAM!B89 -> internal error'</p>
  
  <p>B30:=IF(G32=1,IF(E570,D55&lt;>0),IF(G32=1,IF(E57</p>
  
  <p>E57: ==IF(B44</p>
  
  <p>B56:=B38*SQRT(IF(E44=1,B52,1^(3/4)*B53^(1/4)*B52/E43^(3/4)/E44^(1/4))/E43)</p>
  
  <p>B38: =VLOOKUP(B70,CHART,2)</p>
  
  <p>B89: ==HLOOKUP($E$4,WLC2CV,VLOOKUP($B$4,WLC2CV,15))</p>
  
  <p>and there is warning generated, when i am handling the exception by assigning it old calculated values.</p>
  
  <p>Warning (2): sqrt() expects parameter 1 to be double, string given [APP\vendors\Classes\PHPExcel\Calculation.php, line 3324]</p>