diff --git a/.gitignore b/.gitignore
index f478dd0..54edb37 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@ pom.xml.asc
 .clay*
 *qmd
 .clerk
+.calva
diff --git a/deps.edn b/deps.edn
index c75cccf..ad512a6 100644
--- a/deps.edn
+++ b/deps.edn
@@ -14,5 +14,6 @@
            :test {:extra-paths ["test"]
                   :extra-deps {io.github.cognitect-labs/test-runner
                                {:git/tag "v0.5.0" :git/sha "b3fd0d2"}}
+                  :jvm-opts ["-Djava.awt.headless=true"]
                   :main-opts ["-m" "cognitect.test-runner"]
                   :exec-fn cognitect.test-runner.api/test}}}
diff --git a/src/clojisr/v1/impl/java_to_clj.clj b/src/clojisr/v1/impl/java_to_clj.clj
index 2005cb6..c051c3c 100644
--- a/src/clojisr/v1/impl/java_to_clj.clj
+++ b/src/clojisr/v1/impl/java_to_clj.clj
@@ -2,9 +2,11 @@
   (:require [tech.v3.dataset :as ds]
             [tech.v3.dataset.column :as col]
             [tech.v3.datatype :refer [->reader]]
-
+            [tech.v3.tensor :as dtt]
             [clojisr.v1.impl.protocols :as prot]
-            [clojisr.v1.impl.common :refer [tsp->reader first-step->java java->column cartesian-product]]))
+            [clojisr.v1.impl.common :refer [tsp->reader first-step->java java->column cartesian-product]]
+            [tech.v3.datatype :as dtype]
+            [ tech.v3.tensor.dimensions :as tdim]))
 
 (set! *unchecked-math* :warn-on-boxed)
 
@@ -92,12 +94,28 @@
           (apply ds/concat)))))
 
 (defn multidim? [obj] (prot/attribute obj "dim"))
-(defn multidim->dataset
-  ([exp] (multidim->dataset exp nil))
-  ([exp extra]
-   (let [dims (fix-dims (prot/attribute exp "dim"))
-         dimnames (fix-dimnames dims (prot/attribute exp "dimnames"))]
-     (make-nd exp extra dims dimnames))))
+
+(defn- make-tensor [exp dims]
+  
+  (def exp exp)
+  (def dims dims)
+  
+  (dtt/construct-tensor (prot/->clj exp) 
+                        (tdim/dimensions dims)))
+  ;; (dtt/->tensor [[7 4 6 8 8 7 5 9 7 8]
+  ;;                [4 1 3 6 5 2 3 5 4 2]
+  ;;                [3 8 5 1 7 9 3 8 5 2]] :datatype :float64))
+(defn multidim->dataset-or-tensor
+  ([exp] (multidim->dataset-or-tensor exp nil nil))
+  ([exp extra] (multidim->dataset-or-tensor exp extra nil))
+  ([exp extra options]
+   
+     
+     (let [dims (fix-dims (prot/attribute exp "dim"))
+           dimnames (fix-dimnames dims (prot/attribute exp "dimnames"))]
+       (if (:as-tensor options)
+         (make-tensor exp dims)
+         (make-nd exp extra dims dimnames)))))
 
 (defn mts? [obj] (prot/inherits? obj "mts"))
 (defn mts->dataset
@@ -105,7 +123,7 @@
   (let [tsp (-> exp
                 (prot/attribute "tsp")
                 (tsp->reader))]
-    (multidim->dataset exp [tsp :$time])))
+    (multidim->dataset-or-tensor exp [tsp :$time])))
 
 
 ;; table
@@ -153,18 +171,22 @@
 
 (defn java->clj
   "Perform high level data conversion"
-  [exp]
-  (let [exp (first-step->java exp)]
-    (cond
-      (data-frame? exp) (data-frame->dataset exp)
-      (mts? exp) (mts->dataset exp)
-      (timeseries? exp) (timeseries->dataset exp)
-      (dist? exp) (dist->dataset exp)
-      (table? exp) (table->dataset exp)
-      (multidim? exp) (multidim->dataset exp)
-      :else (prot/->clj exp))))
-
-(defn java->native
-  [exp]
-  (prot/->native exp))
+  
+  ([exp options]
+   ;(println :options options)
+   (def options options)
+   (let [exp (first-step->java exp)]
+     (cond
+       (data-frame? exp) (data-frame->dataset exp)
+       (mts? exp) (mts->dataset exp)
+       (timeseries? exp) (timeseries->dataset exp)
+       (dist? exp) (dist->dataset exp)
+       (table? exp) (table->dataset exp)
+       (multidim? exp) (multidim->dataset-or-tensor exp nil options)
+       :else (prot/->clj exp))))
+  ( [exp] (java->clj exp nil)))
+
+  (defn java->native
+    [exp]
+    (prot/->native exp))
 
diff --git a/src/clojisr/v1/impl/rserve/call.clj b/src/clojisr/v1/impl/rserve/call.clj
index f00629b..782f33a 100644
--- a/src/clojisr/v1/impl/rserve/call.clj
+++ b/src/clojisr/v1/impl/rserve/call.clj
@@ -31,12 +31,18 @@
 
 (defn try-eval-catching-errors [expression ^RConnection r-connection]
   ;; Using the technique of https://stackoverflow.com/a/40447542/1723677, the way it is used in Rojure.
+  (def expression expression)
   (try
     (let [expression-str (-> expression
                              (string/escape char-escape-string)
                              (->> (format "try(eval(parse(text=\"%s\")),silent=TRUE)")))
           ^REXP rexp (locking r-connection
                        (.parseAndEval r-connection expression-str))]
+           (def rexp rexp)
+      
+      (clojure.reflect/reflect rexp)
+      (.asIntegers rexp)
+
       (if (.inherits rexp "try-error")
         (do (log/error [::try-eval-catching-errors {:message (format "Error in R evaluating expression: %s. R exception: %s"
                                                                      expression (.asString rexp))}])
diff --git a/src/clojisr/v1/r.clj b/src/clojisr/v1/r.clj
index 209e96e..8215e80 100644
--- a/src/clojisr/v1/r.clj
+++ b/src/clojisr/v1/r.clj
@@ -11,7 +11,8 @@
             [clojure.string :as string]
             [clojisr.v1.util :refer [bracket-data maybe-wrap-backtick]]
             [clojisr.v1.require :refer [require-r-package]]
-            [clojisr.v1.engines :refer [engines]])
+            [clojisr.v1.engines :refer [engines]]
+            [tech.v3.tensor :as dtt])
   (:import clojisr.v1.robject.RObject))
 
 (defn init [& {:keys [session-args]}]
@@ -40,7 +41,7 @@
 (defn java->native-clj [java-object]
   (java2clj/java->native java-object))
 
-(defn java->clj [java-object] (java2clj/java->clj java-object))
+(defn java->clj [java-object & options] (java2clj/java->clj java-object options))
 
 (defn clj->java [clj-object & {:keys [session-args]}]
   (let [session (session/fetch-or-make session-args)]
@@ -49,7 +50,13 @@
 (def clj->java->r (comp java->r clj->java))
 (def clj->r clj->java->r)
 
-(defn r->java->clj [r-object] (-> r-object r r->java java2clj/java->clj))
+(defn r->java->clj 
+  ([r-object options] 
+   (-> r-object 
+       (r) 
+       (r->java) 
+       (java2clj/java->clj options)))
+  ( [r-object] (r->java->clj r-object nil)))
 (def r->clj r->java->clj)
 
 (defn r->java->native-clj [r-object] (-> r r-object r->java java2clj/java->native))
@@ -222,3 +229,45 @@
   "Prints help for an R object or function"
   ([r-object] (println (help r-object)))
   ([function package] (println (help function package))))
+
+(comment
+  (require-r '[datasets])
+  
+  (require-r '[base])
+  
+  (r "m <- array(seq(1, 10*5*4*7), dim=c(10, 5, 4,7))")
+  
+
+  ( r)
+  
+  (def m (-> (r "m")
+             ( r->clj {:as-tensor true})))
+
+  (r "dim(m)")
+  
+  )
+
+(require '[tech.v3.tensor :as dtt])
+
+(r "m[10,5,4,7]")
+;;=> [1] 1400
+(dtt/mget m 9 4 3 6)
+;;=> 1400
+
+
+(r "m[1,1,1,1]")
+;;=> [1] 1
+(dtt/mget m 0 0 0 0)
+;;=> 1
+
+(r "m[3,3,3,3]")
+;;=> [1] 523
+;;   
+
+;;   
+(dtt/mget m 2 2 2 2)
+;;=> 353
+
+(r "print(.MEM$xe6ab3051a83d48f3)")
+
+(r "capture.output(print(.MEM$x9cd80e7a0ca4471b))")
\ No newline at end of file
diff --git a/test/clojisr/v1/matrix_test.clj b/test/clojisr/v1/matrix_test.clj
new file mode 100644
index 0000000..0fddd64
--- /dev/null
+++ b/test/clojisr/v1/matrix_test.clj
@@ -0,0 +1,24 @@
+(ns clojisr.v1.matrix-test
+  (:require 
+   [clojure.test :refer [deftest is]]
+   [clojisr.v1.r :as r]))
+
+(r/require-r '[base])
+
+(deftest options-are-optional-without
+  
+  (is (= (range 5)
+         (->
+          (r.base/matrix (range 5))
+          (r/r->clj)
+          (get 1)))))
+
+
+(deftest options-are-optional-wit
+  ;; does not crash
+  (is (= (range 5)
+         (->
+          (r.base/matrix (range 5))
+          (r/r->clj {:some-option true})
+          (get 1)))))
+