add EXPON.DIST function

cell/model/FormulaObjects/statisticalFunctions.js

@@ -62,7 +62,7 @@
 	cFormulaFunctionGroup['Statistical'] = cFormulaFunctionGroup['Statistical'] || [];
 	cFormulaFunctionGroup['Statistical'].push(cAVEDEV, cAVERAGE, cAVERAGEA, cAVERAGEIF, cAVERAGEIFS, cBETADIST, cBETA_DIST,
 		cBETA_INV, cBINOMDIST, cCHIDIST, cCHIINV, cCHISQ_DIST, cCHISQ_DIST_RT, cCHISQ_INV, cCHISQ_INV_RT, cCHITEST, cCONFIDENCE, cCORREL, cCOUNT, cCOUNTA, cCOUNTBLANK, cCOUNTIF,
-		cCOUNTIFS, cCOVAR, cCRITBINOM, cDEVSQ, cEXPONDIST, cFDIST, cF_DIST, cF_DIST_RT, cF_INV, cF_INV_RT, cFINV, cFISHER, cFISHERINV, cFORECAST, cFREQUENCY,
+		cCOUNTIFS, cCOVAR, cCRITBINOM, cDEVSQ, cEXPON_DIST, cEXPONDIST, cFDIST, cF_DIST, cF_DIST_RT, cF_INV, cF_INV_RT, cFINV, cFISHER, cFISHERINV, cFORECAST, cFREQUENCY,
 		cFTEST, cGAMMA, cGAMMADIST, cGAMMAINV, cGAMMA_DIST, cGAMMA_INV, cGAMMALN, cGAMMALN_PRECISE, cGAUSS, cGEOMEAN, cGROWTH, cHARMEAN, cHYPGEOMDIST, cINTERCEPT, cKURT, cLARGE,
 		cLINEST, cLOGEST, cLOGINV, cLOGNORM_DIST, cLOGNORM_INV, cLOGNORMDIST, cMAX, cMAXA, cMEDIAN, cMIN, cMINA, cMODE, cNEGBINOMDIST, cNORMDIST,
 		cNORMINV, cNORMSDIST, cNORMSINV, cPEARSON, cPERCENTILE, cPERCENTRANK, cPERMUT, cPOISSON, cPROB, cQUARTILE,
@@ -2598,6 +2598,59 @@
 		};
 	};
 
+	/**
+	 * @constructor
+	 * @extends {AscCommonExcel.cBaseFunction}
+	 */
+	function cEXPON_DIST() {
+		this.name = "EXPON.DIST";
+		this.value = null;
+		this.argumentsCurrent = 0;
+	}
+
+	cEXPON_DIST.prototype = Object.create(cBaseFunction.prototype);
+	cEXPON_DIST.prototype.constructor = cEXPON_DIST;
+	cEXPON_DIST.prototype.argumentsMin = 3;
+	cEXPON_DIST.prototype.argumentsMax = 3;
+	cEXPON_DIST.prototype.Calculate = function (arg) {
+		var oArguments = this._prepareArguments(arg, arguments[1], true);
+		var argClone = oArguments.args;
+
+		argClone[0] = argClone[0].tocNumber();
+		argClone[1] = argClone[1].tocNumber();
+		argClone[2] = argClone[2].tocNumber();
+
+		var argError;
+		if (argError = this._checkErrorArg(argClone)) {
+			return this.value = argError;
+		}
+
+		var calcFDist = function(argArray){
+			var arg0 = argArray[0];
+			var arg1 = argArray[1];
+			var arg2 = argArray[2];
+
+			if (arg0 < 0 || arg1 <= 0) {
+				return new cError(cErrorType.not_numeric);
+			}
+
+			var res = null;
+			if (arg2) {
+				res = 1 - Math.exp(-arg1 * arg0);
+			} else {
+				res = arg1 * Math.exp(-arg1 * arg0);
+			}
+			return null !== res && !isNaN(res) ? new cNumber(res) : new cError(cErrorType.wrong_value_type);
+		};
+
+		return this.value = this._findArrayInNumberArguments(oArguments, calcFDist);
+	};
+	cEXPON_DIST.prototype.getInfo = function () {
+		return {
+			name: this.name, args: "( x , lambda , cumulative-flag )"
+		};
+	};
+
 	/**
 	 * @constructor
 	 * @extends {AscCommonExcel.cBaseFunction}