diff --git a/src/main/java/org/math/R/R2js/AbstractR2jsSession.java b/src/main/java/org/math/R/AbstractR2jsSession.java
similarity index 99%
rename from src/main/java/org/math/R/R2js/AbstractR2jsSession.java
rename to src/main/java/org/math/R/AbstractR2jsSession.java
index 318ae0ae..78add0c3 100644
--- a/src/main/java/org/math/R/R2js/AbstractR2jsSession.java
+++ b/src/main/java/org/math/R/AbstractR2jsSession.java
@@ -1,4 +1,4 @@
-package org.math.R.R2js;
+package org.math.R;
 
 import java.io.BufferedReader;
 import java.io.File;
@@ -13,7 +13,6 @@
 import java.util.stream.Collectors;
 
 import org.apache.commons.io.FileUtils;
-import org.math.R.*;
 
 /**
  * This class evaluate an R expression by parsing it in javascript expression
diff --git a/src/main/java/org/math/R/R2js/R2jsSession.java b/src/main/java/org/math/R/R2jsSession.java
similarity index 99%
rename from src/main/java/org/math/R/R2js/R2jsSession.java
rename to src/main/java/org/math/R/R2jsSession.java
index 56a91e83..43ddd328 100644
--- a/src/main/java/org/math/R/R2js/R2jsSession.java
+++ b/src/main/java/org/math/R/R2jsSession.java
@@ -1,8 +1,4 @@
-package org.math.R.R2js;
-
-import org.math.R.RLog;
-import org.math.R.RLogPrintStream;
-import org.math.R.Rsession;
+package org.math.R;
 
 import javax.script.ScriptEngine;
 import javax.script.ScriptEngineManager;
diff --git a/src/main/java/org/math/R/R2js/R2jsUtils.java b/src/main/java/org/math/R/R2jsUtils.java
similarity index 99%
rename from src/main/java/org/math/R/R2js/R2jsUtils.java
rename to src/main/java/org/math/R/R2jsUtils.java
index ef916e28..9aee6eeb 100644
--- a/src/main/java/org/math/R/R2js/R2jsUtils.java
+++ b/src/main/java/org/math/R/R2jsUtils.java
@@ -3,7 +3,7 @@
  * To change this template file, choose Tools | Templates
  * and open the template in the editor.
  */
-package org.math.R.R2js;
+package org.math.R;
 
 import java.util.ArrayList;
 import java.util.List;
diff --git a/src/main/resources/org/math/R/R.js b/src/main/resources/org/math/R/R.js
index c655a7c5..e249f8d7 100644
--- a/src/main/resources/org/math/R/R.js
+++ b/src/main/resources/org/math/R/R.js
@@ -558,12 +558,12 @@
     
     function SysSetEnv(kv) {
         for(var k in kv) {
-            Java.type('org.math.R.R2js.AbstractR2jsSession').setEnv(k,kv[k]);
+            Java.type('org.math.R.AbstractR2jsSession').setEnv(k,kv[k]);
         }
     }
 
     function SysGetEnv(k) {
-        var v = Java.type('org.math.R.R2js.AbstractR2jsSession').getEnv(k);
+        var v = Java.type('org.math.R.AbstractR2jsSession').getEnv(k);
 	    if (isNull(v))
             return '';
         return v;
diff --git a/src/test/java/org/math/R/BasicTest.java b/src/test/java/org/math/R/BasicTest.java
index ebaa806c..77b9ad0e 100644
--- a/src/test/java/org/math/R/BasicTest.java
+++ b/src/test/java/org/math/R/BasicTest.java
@@ -9,8 +9,6 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.math.R.R2js.AbstractR2jsSession;
-import org.math.R.R2js.R2jsSession;
 
 /**
  *
diff --git a/src/test/java/org/math/R/BrentTest.java b/src/test/java/org/math/R/BrentTest.java
index 9b01a326..d686db7e 100644
--- a/src/test/java/org/math/R/BrentTest.java
+++ b/src/test/java/org/math/R/BrentTest.java
@@ -7,8 +7,6 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.math.R.R2js.R2jsSession;
-import org.math.R.R2js.AbstractR2jsSession;
 import org.math.array.DoubleArray;
 import org.math.array.LinearAlgebra;
 
diff --git a/src/test/java/org/math/R/GradientDescent1DTest.java b/src/test/java/org/math/R/GradientDescent1DTest.java
index df7ede1f..6be16eee 100644
--- a/src/test/java/org/math/R/GradientDescent1DTest.java
+++ b/src/test/java/org/math/R/GradientDescent1DTest.java
@@ -7,8 +7,6 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.math.R.R2js.AbstractR2jsSession;
-import org.math.R.R2js.R2jsSession;
 import org.math.R.Rsession.RException;
 import org.math.array.DoubleArray;
 
diff --git a/src/test/java/org/math/R/GradientDescentTest.java b/src/test/java/org/math/R/GradientDescentTest.java
index a4e05909..483ac362 100644
--- a/src/test/java/org/math/R/GradientDescentTest.java
+++ b/src/test/java/org/math/R/GradientDescentTest.java
@@ -6,8 +6,6 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.math.R.R2js.AbstractR2jsSession;
-import org.math.R.R2js.R2jsSession;
 import org.math.R.Rsession.RException;
 import org.math.array.DoubleArray;
 
diff --git a/src/test/java/org/math/R/R2js/R2jsParserTest.java b/src/test/java/org/math/R/R2jsParserTest.java
similarity index 98%
rename from src/test/java/org/math/R/R2js/R2jsParserTest.java
rename to src/test/java/org/math/R/R2jsParserTest.java
index aa20bd47..3212c95f 100644
--- a/src/test/java/org/math/R/R2js/R2jsParserTest.java
+++ b/src/test/java/org/math/R/R2jsParserTest.java
@@ -1,8 +1,10 @@
-package org.math.R.R2js;
+package org.math.R;
 
 import java.util.Arrays;
 import java.util.List;
 import org.junit.Test;
+import org.math.R.AbstractR2jsSession;
+import org.math.R.R2jsUtils;
 import org.math.R.Rsession;
 
 /**
diff --git a/src/test/java/org/math/R/R2js/R2jsSessionTest.java b/src/test/java/org/math/R/R2jsSessionTest.java
similarity index 94%
rename from src/test/java/org/math/R/R2js/R2jsSessionTest.java
rename to src/test/java/org/math/R/R2jsSessionTest.java
index 017ad1d7..df0ac0a3 100644
--- a/src/test/java/org/math/R/R2js/R2jsSessionTest.java
+++ b/src/test/java/org/math/R/R2jsSessionTest.java
@@ -1,4 +1,4 @@
-package org.math.R.R2js;
+package org.math.R;
 
 import java.io.*;
 import java.net.InetAddress;
@@ -16,8 +16,6 @@
 //import org.graalvm.polyglot.*;
 
 import org.junit.Test;
-import org.math.R.RLog;
-import org.math.R.RLogSlf4j;
 import org.math.R.Rsession.RException;
 
 import static org.junit.Assert.*;
@@ -1484,87 +1482,4 @@ public void testDecimalPoints() throws RException {
         assert (Double) engine.eval("1e-31+1e-32") == 1.1e-31;
         assertEquals((Double) engine.eval("1e-31*1e-32"),  1e-63, 1e-75); //"normal" floating error of 1e-15 on multiplication
     }
-
-//    @Test
-//    public void testEvaluationTime() throws RException, ScriptException, IOException {
-//        String MATH_JS_FILE = "/org/math/R/math.js";
-//        InputStream mathInputStream = this.getClass().getResourceAsStream(MATH_JS_FILE);
-////
-////
-////        StringBuilder textBuilder = new StringBuilder();
-////        try (Reader reader = new BufferedReader(new InputStreamReader
-////                (mathInputStream, StandardCharsets.UTF_8))) {
-////            int c = 0;
-////            while ((c = reader.read()) != -1) {
-////                textBuilder.append((char) c);
-////            }
-////        }
-////
-////        Context polyglotContext = Context.create();
-//
-////
-////        //polyglotContext.eval("js", textBuilder);
-//
-//
-//        // POLYGLOT
-////        long time1 = System.currentTimeMillis();
-////        Source scriptSource = Source.newBuilder("js",new File("/home/chabs/Documents/workspaces/rsession/src/main/resources/org/math/R/math.js")).build();
-////        Engine engine = Engine.create();
-////        Context ctx = Context.newBuilder()
-////                .engine(engine)
-////                .build();
-////        long time2 = System.currentTimeMillis();
-////
-////        Value result = ctx.eval(scriptSource);
-////        //Value math = ctx.getBindings("js").getMember("math");
-////        System.out.println("Res=" + ctx.eval("js", "math.add(1,2)"));
-////
-////        long time3 = System.currentTimeMillis();
-////
-////        //Context newContext = Context.newBuilder("js").(true).option("js.foreign-object-prototype", Boolean.TRUE.toString()).build();
-////        Context newContext = Context.newBuilder()
-////                .engine(engine)
-////                .build();
-////        newContext.eval(scriptSource);
-////        //newContext.getBindings("js").putMember("math", math);
-////
-////        System.out.println("Res=" + newContext.eval("js", "math.add(1,11)"));
-////
-////        long time4 = System.currentTimeMillis();
-////
-////        System.out.println("Evaluation time polyglot:" + (time2 - time1) + " ms");
-////        System.out.println("Evaluation time polyglot:" + (time3 - time2) + " ms");
-////        System.out.println("Evaluation time polyglot:" + (time4 - time3) + " ms");
-//
-//
-//
-//        long time1 = System.currentTimeMillis();
-//        ScriptEngineManager manager = new ScriptEngineManager(null);
-//        long time11 = System.currentTimeMillis();
-//        ScriptEngine js = manager.getEngineByName("JavaScript");
-//        if (js==null) js = manager.getEngineByName("js");
-//        if (js==null) js = manager.getEngineByExtension("js");
-//        if (js==null) js = manager.getEngineByName("nashorn");
-//        if (js==null) js = manager.getEngineByName("Nashorn");
-//        //if (js==null) js = new jdk.nashorn.api.scripting.NashornScriptEngineFactory().getScriptEngine();
-//        if (js==null) throw new IllegalArgumentException("Could not load JavaScript ScriptEngine: "+manager.getEngineFactories());
-//
-//        long time2 = System.currentTimeMillis();
-//        js.eval(new InputStreamReader(mathInputStream, Charset.forName("UTF-8")));
-//        System.out.println("Res="+ js.eval("math.add(1,2)"));
-//        Object math = js.get("math");
-//        long time3 = System.currentTimeMillis();
-//        ScriptEngine js2 = manager.getEngineByName("JavaScript");
-//        //System.out.println("Res="+ js2.eval("math.add(1,11)"));
-//        js2.put("math", math);
-//        System.out.println("Res="+ js2.eval("math.add(1,11)"));
-//        long time4 = System.currentTimeMillis();
-//
-//        System.out.println("Evaluation time polyglot---:" + (time11 - time1) + " ms");
-//        System.out.println("Evaluation time polyglot:" + (time2 - time1) + " ms");
-//        System.out.println("Evaluation time polyglot:" + (time3 - time2) + " ms");
-//        System.out.println("Evaluation time polyglot:" + (time4 - time3) + " ms");
-//
-//    }
-
 }
diff --git a/src/test/java/org/math/R/RPanelsTest.java b/src/test/java/org/math/R/RPanelsTest.java
index 9b2b06ae..8d40921f 100644
--- a/src/test/java/org/math/R/RPanelsTest.java
+++ b/src/test/java/org/math/R/RPanelsTest.java
@@ -10,8 +10,6 @@
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
-import org.math.R.R2js.AbstractR2jsSession;
-import org.math.R.R2js.R2jsSession;
 import org.math.R.Rsession.RException;
 
 /**