diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/FastHistogram.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/FastHistogram.kt
index 5fd4c7f03..b043b1e18 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/FastHistogram.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/FastHistogram.kt
@@ -6,13 +6,13 @@ import scientifik.kmath.structures.NDStructure
 import scientifik.kmath.structures.ndStructure
 import kotlin.math.floor
 
-class MultivariateBin(override val center: RealVector, val sizes: RealVector, val counter: LongCounter = LongCounter()) : Bin {
+class MultivariateBin(override val center: RealVector, val sizes: RealVector, val counter: LongCounter = LongCounter()) : Bin<Double> {
     init {
         if (center.size != sizes.size) error("Dimension mismatch in bin creation. Expected ${center.size}, but found ${sizes.size}")
     }
 
     override fun contains(vector: RealVector): Boolean {
-        if(vector.size != center.size) error("Dimension mismatch for input vector. Expected ${center.size}, but found ${vector.size}")
+        if (vector.size != center.size) error("Dimension mismatch for input vector. Expected ${center.size}, but found ${vector.size}")
         return vector.asSequence().mapIndexed { i, value -> value in (center[i] - sizes[i] / 2)..(center[i] + sizes[i] / 2) }.all { it }
     }
 
@@ -28,8 +28,8 @@ class MultivariateBin(override val center: RealVector, val sizes: RealVector, va
 class FastHistogram(
         private val lower: RealVector,
         private val upper: RealVector,
-        private val binNums: IntArray = IntArray(lower.size) { 100 }
-) : Histogram<MultivariateBin> {
+        private val binNums: IntArray = IntArray(lower.size) { 20 }
+) : Histogram<Double, MultivariateBin> {
 
     init {
         // argument checks
@@ -105,7 +105,7 @@ class FastHistogram(
          *)
          *```
          */
-        fun fromRanges(vararg ranges: Pair<ClosedFloatingPointRange<Double>,Int>): FastHistogram {
+        fun fromRanges(vararg ranges: Pair<ClosedFloatingPointRange<Double>, Int>): FastHistogram {
             return FastHistogram(
                     ranges.map { it.first.start }.toVector(),
                     ranges.map { it.first.endInclusive }.toVector(),
diff --git a/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt b/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt
index 79b06ee10..9f6365888 100644
--- a/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt
+++ b/kmath-core/src/commonMain/kotlin/scientifik/kmath/histogram/Histogram.kt
@@ -1,6 +1,6 @@
 package scientifik.kmath.histogram
 
-import scientifik.kmath.linear.RealVector
+import scientifik.kmath.linear.Vector
 import scientifik.kmath.linear.toVector
 import scientifik.kmath.operations.Space
 
@@ -8,28 +8,28 @@ import scientifik.kmath.operations.Space
  * A simple geometric domain
  * TODO move to geometry module
  */
-interface Domain {
-    operator fun contains(vector: RealVector): Boolean
+interface Domain<T: Any> {
+    operator fun contains(vector: Vector<T>): Boolean
     val dimension: Int
 }
 
 /**
  * The bin in the histogram. The histogram is by definition always done in the real space
  */
-interface Bin : Domain {
+interface Bin<T: Any> : Domain<T> {
     /**
      * The value of this bin
      */
     val value: Number
-    val center: RealVector
+    val center: Vector<T>
 }
 
-interface Histogram<out B : Bin> : Iterable<B> {
+interface Histogram<T: Any, out B : Bin<T>> : Iterable<B> {
 
     /**
      * Find existing bin, corresponding to given coordinates
      */
-    operator fun get(point: RealVector): B?
+    operator fun get(point: Vector<T>): B?
 
     /**
      * Dimension of the histogram
@@ -39,24 +39,24 @@ interface Histogram<out B : Bin> : Iterable<B> {
     /**
      * Increment appropriate bin
      */
-    fun put(point: RealVector)
+    fun put(point: Vector<T>)
 }
 
-fun Histogram<*>.put(vararg point: Double) = put(point.toVector())
+fun Histogram<Double,*>.put(vararg point: Double) = put(point.toVector())
 
-fun Histogram<*>.fill(sequence: Iterable<RealVector>) = sequence.forEach { put(it) }
+fun <T: Any> Histogram<T,*>.fill(sequence: Iterable<Vector<T>>) = sequence.forEach { put(it) }
 
 /**
  * Pass a sequence builder into histogram
  */
-fun Histogram<*>.fill(buider: suspend SequenceScope<RealVector>.() -> Unit) = fill(sequence(buider).asIterable())
+fun <T: Any> Histogram<T, *>.fill(buider: suspend SequenceScope<Vector<T>>.() -> Unit) = fill(sequence(buider).asIterable())
 
 /**
  * A space to perform arithmetic operations on histograms
  */
-interface HistogramSpace<B : Bin, H : Histogram<B>> : Space<H> {
+interface HistogramSpace<T: Any, B : Bin<T>, H : Histogram<T,B>> : Space<H> {
     /**
      * Rules for performing operations on bins
      */
-    val binSpace: Space<Bin>
+    val binSpace: Space<Bin<T>>
 }
\ No newline at end of file
diff --git a/kmath-core/src/jvmMain/kotlin/scientifik/kmath/histogram/UnivariateHistogram.kt b/kmath-core/src/jvmMain/kotlin/scientifik/kmath/histogram/UnivariateHistogram.kt
index a3b066b02..b614c0716 100644
--- a/kmath-core/src/jvmMain/kotlin/scientifik/kmath/histogram/UnivariateHistogram.kt
+++ b/kmath-core/src/jvmMain/kotlin/scientifik/kmath/histogram/UnivariateHistogram.kt
@@ -7,7 +7,7 @@ import kotlin.math.floor
 
 //TODO move to common
 
-class UnivariateBin(val position: Double, val size: Double, val counter: LongCounter = LongCounter()) : Bin {
+class UnivariateBin(val position: Double, val size: Double, val counter: LongCounter = LongCounter()) : Bin<Double> {
     //TODO add weighting
     override val value: Number get() = counter.sum()
 
@@ -25,7 +25,7 @@ class UnivariateBin(val position: Double, val size: Double, val counter: LongCou
 /**
  * Univariate histogram with log(n) bin search speed
  */
-class UnivariateHistogram private constructor(private val factory: (Double) -> UnivariateBin) : Histogram<UnivariateBin> {
+class UnivariateHistogram private constructor(private val factory: (Double) -> UnivariateBin) : Histogram<Double,UnivariateBin> {
 
     private val bins: TreeMap<Double, UnivariateBin> = TreeMap()