add BESSELJ formula

cell/model/FormulaObjects/engineeringFunctions.js

@@ -943,7 +943,7 @@
 		cOCT2DEC, cOCT2HEX);
 
 	cFormulaFunctionGroup['NotRealised'] = cFormulaFunctionGroup['NotRealised'] || [];
-	cFormulaFunctionGroup['NotRealised'].push(cBESSELI, cBESSELJ, cBESSELK, cBESSELY, cCONVERT);
+	cFormulaFunctionGroup['NotRealised'].push(cBESSELI, cBESSELK, cBESSELY, cCONVERT);
 
 	/**
 	 * @constructor
@@ -1010,6 +1010,51 @@
 
 	cBESSELJ.prototype = Object.create(cBaseFunction.prototype);
 	cBESSELJ.prototype.constructor = cBESSELJ;
+	cBESSELJ.prototype.argumentsMin = 2;
+	cBESSELJ.prototype.argumentsMax = 2;
+	cBESSELJ.prototype.Calculate = function ( arg ) {
+		var x = arg[0],
+			n = arg[1];
+
+		if ( x instanceof cArea || x instanceof cArea3D ) {
+			x = x.cross( arguments[1] );
+		}
+		else if ( x instanceof cArray ) {
+			x = x.getElementRowCol( 0, 0 );
+		}
+
+		if ( n instanceof cArea || n instanceof cArea3D ) {
+			n = n.cross( arguments[1] );
+		}
+		else if ( n instanceof cArray ) {
+			n = n.getElementRowCol( 0, 0 );
+		}
+
+		x = x.tocNumber();
+		n = n.tocNumber();
+
+		if ( x instanceof cError ) {
+			return this.value = x;
+		}
+		if ( n instanceof cError ) {
+			return this.value = n;
+		}
+
+		x = x.getValue();
+		n = n.getValue();
+
+		if ( n < 0 ){
+			return this.value = new cError( cErrorType.not_numeric );
+		}
+		if(x < 0){
+			x = Math.abs(x);
+		}
+		n = Math.floor(n);
+
+		this.value = BesselJ( x, n );
+		return this.value;
+	};
+
 
 	/**
 	 * @constructor