diff --git a/kmath-tensors/src/commonTest/kotlin/space/kscience/kmath/tensors/core/TestDoubleAnalyticTensorAlgebra.kt b/kmath-tensors/src/commonTest/kotlin/space/kscience/kmath/tensors/core/TestDoubleAnalyticTensorAlgebra.kt
index 1e21379b4..b9f4ebd96 100644
--- a/kmath-tensors/src/commonTest/kotlin/space/kscience/kmath/tensors/core/TestDoubleAnalyticTensorAlgebra.kt
+++ b/kmath-tensors/src/commonTest/kotlin/space/kscience/kmath/tensors/core/TestDoubleAnalyticTensorAlgebra.kt
@@ -12,110 +12,250 @@ import kotlin.test.assertTrue
 
 internal class TestDoubleAnalyticTensorAlgebra {
 
-    val shape = intArrayOf(2, 1, 3, 2)
-    val buffer = doubleArrayOf(
-        27.1, 20.0, 19.84,
-        23.123, 3.0, 2.0,
+    val shapeWithNegative = intArrayOf(4)
+    val bufferWithNegative = doubleArrayOf(9.3348, -7.5889,  -1.2005, 1.1584)
+    val tensorWithNegative = DoubleTensor(shapeWithNegative, bufferWithNegative)
 
-        3.23, 133.7, 25.3,
-        100.3, 11.0, 12.012
-    )
-    val tensor = DoubleTensor(shape, buffer)
+    val shape1 = intArrayOf(4)
+    val buffer1 = doubleArrayOf(1.3348, 1.5889,  1.2005, 1.1584)
+    val tensor1 = DoubleTensor(shape1, buffer1)
+
+    val shape2 = intArrayOf(2, 2)
+    val buffer2 = doubleArrayOf(1.0, 9.456, 3.0, 4.0)
+    val tensor2 = DoubleTensor(shape2, buffer2)
+
+    val shape3 = intArrayOf(2, 3, 2)
+    val buffer3 = doubleArrayOf(1.0, 9.456, 7.0, 2.123, 1.0, 9.456, 30.8888, 6.0, 1.0, 9.456, 3.0, 4.99)
+    val tensor3 = DoubleTensor(shape3, buffer3)
+
+    val shape4 = intArrayOf(2, 1, 3, 2)
+    val buffer4 = doubleArrayOf(27.1, 20.0, 19.84, 23.123, 3.0, 2.0, 3.23, 133.7, 25.3, 100.3, 11.0, 12.012)
+    val tensor4 = DoubleTensor(shape4, buffer4)
+
+    val bufferWithNegativeMod1 = bufferWithNegative.map { x -> x % 1 }.toDoubleArray()
+    val tensorWithNegativeMod1 = DoubleTensor(shapeWithNegative, bufferWithNegativeMod1)
+
+    val buffer1Mod1 = buffer1.map { x -> x % 1 }.toDoubleArray()
+    val tensor1Mod1 = DoubleTensor(shape1, buffer1Mod1)
+
+    val buffer2Mod1 = buffer2.map { x -> x % 1 }.toDoubleArray()
+    val tensor2Mod1 = DoubleTensor(shape2, buffer2Mod1)
+
+    val buffer3Mod1 = buffer3.map { x -> x % 1 }.toDoubleArray()
+    val tensor3Mod1 = DoubleTensor(shape3, buffer3Mod1)
+
+    val buffer4Mod1 = buffer4.map { x -> x % 1 }.toDoubleArray()
+    val tensor4Mod1 = DoubleTensor(shape4, buffer4Mod1)
 
     fun DoubleArray.fmap(transform: (Double) -> Double): DoubleArray {
         return this.map(transform).toDoubleArray()
     }
 
-    fun expectedTensor(transform: (Double) -> Double): DoubleTensor {
-        return DoubleTensor(shape, buffer.fmap(transform))
+    fun expectedTensorWithNegative(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shapeWithNegative, bufferWithNegative.fmap(transform))
+    }
+
+    fun expectedTensor1(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape1, buffer1.fmap(transform))
+    }
+
+    fun expectedTensor2(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape2, buffer2.fmap(transform))
+    }
+
+    fun expectedTensor3(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape3, buffer3.fmap(transform))
+    }
+
+    fun expectedTensor4(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape4, buffer4.fmap(transform))
+    }
+
+    fun expectedTensorWithNegativeMod1(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shapeWithNegative, bufferWithNegativeMod1.fmap(transform))
+    }
+
+    fun expectedTensor1Mod1(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape1, buffer1Mod1.fmap(transform))
+    }
+
+    fun expectedTensor2Mod1(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape2, buffer2Mod1.fmap(transform))
+    }
+
+    fun expectedTensor3Mod1(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape3, buffer3Mod1.fmap(transform))
+    }
+
+    fun expectedTensor4Mod1(transform: (Double) -> Double): DoubleTensor {
+        return DoubleTensor(shape4, buffer4Mod1.fmap(transform))
     }
 
     @Test
     fun testExp() = DoubleTensorAlgebra {
-        assertTrue { tensor.exp() eq expectedTensor(::exp) }
+        assertTrue { tensorWithNegative.exp() eq expectedTensorWithNegative(::exp) }
+        assertTrue { tensor1.exp() eq expectedTensor1(::exp) }
+        assertTrue { tensor2.exp() eq expectedTensor2(::exp) }
+        assertTrue { tensor3.exp() eq expectedTensor3(::exp) }
+        assertTrue { tensor4.exp() eq expectedTensor4(::exp) }
     }
 
     @Test
     fun testLog() = DoubleTensorAlgebra {
-        assertTrue { tensor.ln() eq expectedTensor(::ln) }
+        assertTrue { tensor1.ln() eq expectedTensor1(::ln) }
+        assertTrue { tensor2.ln() eq expectedTensor2(::ln) }
+        assertTrue { tensor3.ln() eq expectedTensor3(::ln) }
+        assertTrue { tensor4.ln() eq expectedTensor4(::ln) }
     }
 
     @Test
     fun testSqrt() = DoubleTensorAlgebra {
-        assertTrue { tensor.sqrt() eq expectedTensor(::sqrt) }
+        assertTrue { tensor1.sqrt() eq expectedTensor1(::sqrt) }
+        assertTrue { tensor2.sqrt() eq expectedTensor2(::sqrt) }
+        assertTrue { tensor3.sqrt() eq expectedTensor3(::sqrt) }
+        assertTrue { tensor4.sqrt() eq expectedTensor4(::sqrt) }
     }
 
     @Test
     fun testCos() = DoubleTensorAlgebra {
-        assertTrue { tensor.cos() eq expectedTensor(::cos) }
+        assertTrue { tensorWithNegative.cos() eq expectedTensorWithNegative(::cos) }
+        assertTrue { tensor1.cos() eq expectedTensor1(::cos) }
+        assertTrue { tensor2.cos() eq expectedTensor2(::cos) }
+        assertTrue { tensor3.cos() eq expectedTensor3(::cos) }
+        assertTrue { tensor4.cos() eq expectedTensor4(::cos) }
     }
 
+    @Test
+    fun testAcos() = DoubleTensorAlgebra {
+        assertTrue { tensorWithNegativeMod1.acos() eq expectedTensorWithNegativeMod1(::acos) }
+        assertTrue { tensor1Mod1.acos() eq expectedTensor1Mod1(::acos) }
+        assertTrue { tensor2Mod1.acos() eq expectedTensor2Mod1(::acos) }
+        assertTrue { tensor3Mod1.acos() eq expectedTensor3Mod1(::acos) }
+        assertTrue { tensor4Mod1.acos() eq expectedTensor4Mod1(::acos) }
+    }
 
     @Test
     fun testCosh() = DoubleTensorAlgebra {
-        assertTrue { tensor.cosh() eq expectedTensor(::cosh) }
+        assertTrue { tensorWithNegative.cosh() eq expectedTensorWithNegative(::cosh) }
+        assertTrue { tensor1.cosh() eq expectedTensor1(::cosh) }
+        assertTrue { tensor2.cosh() eq expectedTensor2(::cosh) }
+        assertTrue { tensor3.cosh() eq expectedTensor3(::cosh) }
+        assertTrue { tensor4.cosh() eq expectedTensor4(::cosh) }
     }
 
     @Test
     fun testAcosh() = DoubleTensorAlgebra {
-        assertTrue { tensor.acosh() eq expectedTensor(::acosh) }
+        assertTrue { tensor1.acosh() eq expectedTensor1(::acosh) }
+        assertTrue { tensor2.acosh() eq expectedTensor2(::acosh) }
+        assertTrue { tensor3.acosh() eq expectedTensor3(::acosh) }
+        assertTrue { tensor4.acosh() eq expectedTensor4(::acosh) }
     }
 
     @Test
     fun testSin() = DoubleTensorAlgebra {
-        assertTrue { tensor.sin() eq expectedTensor(::sin) }
+        assertTrue { tensorWithNegative.sin() eq expectedTensorWithNegative(::sin) }
+        assertTrue { tensor1.sin() eq expectedTensor1(::sin) }
+        assertTrue { tensor2.sin() eq expectedTensor2(::sin) }
+        assertTrue { tensor3.sin() eq expectedTensor3(::sin) }
+        assertTrue { tensor4.sin() eq expectedTensor4(::sin) }
+    }
+
+    @Test
+    fun testAsin() = DoubleTensorAlgebra {
+        assertTrue { tensorWithNegativeMod1.asin() eq expectedTensorWithNegativeMod1(::asin) }
+        assertTrue { tensor1Mod1.asin() eq expectedTensor1Mod1(::asin) }
+        assertTrue { tensor2Mod1.asin() eq expectedTensor2Mod1(::asin) }
+        assertTrue { tensor3Mod1.asin() eq expectedTensor3Mod1(::asin) }
+        assertTrue { tensor4Mod1.asin() eq expectedTensor4Mod1(::asin) }
     }
 
     @Test
     fun testSinh() = DoubleTensorAlgebra {
-        assertTrue { tensor.sinh() eq expectedTensor(::sinh) }
+        assertTrue { tensorWithNegative.sinh() eq expectedTensorWithNegative(::sinh) }
+        assertTrue { tensor1.sinh() eq expectedTensor1(::sinh) }
+        assertTrue { tensor2.sinh() eq expectedTensor2(::sinh) }
+        assertTrue { tensor3.sinh() eq expectedTensor3(::sinh) }
+        assertTrue { tensor4.sinh() eq expectedTensor4(::sinh) }
     }
 
     @Test
     fun testAsinh() = DoubleTensorAlgebra {
-        assertTrue { tensor.asinh() eq expectedTensor(::asinh) }
+        assertTrue { tensorWithNegative.asinh() eq expectedTensorWithNegative(::asinh) }
+        assertTrue { tensor1.asinh() eq expectedTensor1(::asinh) }
+        assertTrue { tensor2.asinh() eq expectedTensor2(::asinh) }
+        assertTrue { tensor3.asinh() eq expectedTensor3(::asinh) }
+        assertTrue { tensor4.asinh() eq expectedTensor4(::asinh) }
     }
 
     @Test
     fun testTan() = DoubleTensorAlgebra {
-        assertTrue { tensor.tan() eq expectedTensor(::tan) }
+        assertTrue { tensorWithNegative.tan() eq expectedTensorWithNegative(::tan) }
+        assertTrue { tensor1.tan() eq expectedTensor1(::tan) }
+        assertTrue { tensor2.tan() eq expectedTensor2(::tan) }
+        assertTrue { tensor3.tan() eq expectedTensor3(::tan) }
+        assertTrue { tensor4.tan() eq expectedTensor4(::tan) }
     }
 
     @Test
     fun testAtan() = DoubleTensorAlgebra {
-        assertTrue { tensor.atan() eq expectedTensor(::atan) }
+        assertTrue { tensorWithNegative.atan() eq expectedTensorWithNegative(::atan) }
+        assertTrue { tensor1.atan() eq expectedTensor1(::atan) }
+        assertTrue { tensor2.atan() eq expectedTensor2(::atan) }
+        assertTrue { tensor3.atan() eq expectedTensor3(::atan) }
+        assertTrue { tensor4.atan() eq expectedTensor4(::atan) }
     }
 
     @Test
     fun testTanh() = DoubleTensorAlgebra {
-        assertTrue { tensor.tanh() eq expectedTensor(::tanh) }
+        assertTrue { tensorWithNegative.tanh() eq expectedTensorWithNegative(::tanh) }
+        assertTrue { tensor1.tanh() eq expectedTensor1(::tanh) }
+        assertTrue { tensor2.tanh() eq expectedTensor2(::tanh) }
+        assertTrue { tensor3.tanh() eq expectedTensor3(::tanh) }
+        assertTrue { tensor4.tanh() eq expectedTensor4(::tanh) }
+    }
+
+    @Test
+    fun testAtanh() = DoubleTensorAlgebra {
+        assertTrue { tensorWithNegativeMod1.atanh() eq expectedTensorWithNegativeMod1(::atanh) }
+        assertTrue { tensor1Mod1.atanh() eq expectedTensor1Mod1(::atanh) }
+        assertTrue { tensor2Mod1.atanh() eq expectedTensor2Mod1(::atanh) }
+        assertTrue { tensor3Mod1.atanh() eq expectedTensor3Mod1(::atanh) }
+        assertTrue { tensor4Mod1.atanh() eq expectedTensor4Mod1(::atanh) }
     }
 
     @Test
     fun testCeil() = DoubleTensorAlgebra {
-        assertTrue { tensor.ceil() eq expectedTensor(::ceil) }
+        assertTrue { tensorWithNegative.ceil() eq expectedTensorWithNegative(::ceil) }
+        assertTrue { tensor1.ceil() eq expectedTensor1(::ceil) }
+        assertTrue { tensor2.ceil() eq expectedTensor2(::ceil) }
+        assertTrue { tensor3.ceil() eq expectedTensor3(::ceil) }
+        assertTrue { tensor4.ceil() eq expectedTensor4(::ceil) }
     }
 
     @Test
     fun testFloor() = DoubleTensorAlgebra {
-        assertTrue { tensor.floor() eq expectedTensor(::floor) }
+        assertTrue { tensorWithNegative.floor() eq expectedTensorWithNegative(::floor) }
+        assertTrue { tensor1.floor() eq expectedTensor1(::floor) }
+        assertTrue { tensor2.floor() eq expectedTensor2(::floor) }
+        assertTrue { tensor3.floor() eq expectedTensor3(::floor) }
+        assertTrue { tensor4.floor() eq expectedTensor4(::floor) }
     }
 
-    val shape2 = intArrayOf(2, 2)
-    val buffer2 = doubleArrayOf(
+    val shape5 = intArrayOf(2, 2)
+    val buffer5 = doubleArrayOf(
         1.0, 2.0,
         -3.0, 4.0
     )
-    val tensor2 = DoubleTensor(shape2, buffer2)
+    val tensor5 = DoubleTensor(shape5, buffer5)
 
     @Test
     fun testMin() = DoubleTensorAlgebra {
-        assertTrue { tensor2.min() == -3.0 }
-        assertTrue { tensor2.min(0, true) eq fromArray(
+        assertTrue { tensor5.min() == -3.0 }
+        assertTrue { tensor5.min(0, true) eq fromArray(
             intArrayOf(1, 2),
             doubleArrayOf(-3.0, 2.0)
         )}
-        assertTrue { tensor2.min(1, false) eq fromArray(
+        assertTrue { tensor5.min(1, false) eq fromArray(
             intArrayOf(2),
             doubleArrayOf(1.0, -3.0)
         )}
@@ -123,12 +263,12 @@ internal class TestDoubleAnalyticTensorAlgebra {
 
     @Test
     fun testMax() = DoubleTensorAlgebra {
-        assertTrue { tensor2.max() == 4.0 }
-        assertTrue { tensor2.max(0, true) eq fromArray(
+        assertTrue { tensor5.max() == 4.0 }
+        assertTrue { tensor5.max(0, true) eq fromArray(
             intArrayOf(1, 2),
             doubleArrayOf(1.0, 4.0)
         )}
-        assertTrue { tensor2.max(1, false) eq fromArray(
+        assertTrue { tensor5.max(1, false) eq fromArray(
             intArrayOf(2),
             doubleArrayOf(2.0, 4.0)
         )}
@@ -136,12 +276,12 @@ internal class TestDoubleAnalyticTensorAlgebra {
 
     @Test
     fun testSum() = DoubleTensorAlgebra {
-        assertTrue { tensor2.sum() == 4.0 }
-        assertTrue { tensor2.sum(0, true) eq fromArray(
+        assertTrue { tensor5.sum() == 4.0 }
+        assertTrue { tensor5.sum(0, true) eq fromArray(
             intArrayOf(1, 2),
             doubleArrayOf(-2.0, 6.0)
         )}
-        assertTrue { tensor2.sum(1, false) eq fromArray(
+        assertTrue { tensor5.sum(1, false) eq fromArray(
             intArrayOf(2),
             doubleArrayOf(3.0, 1.0)
         )}
@@ -149,15 +289,14 @@ internal class TestDoubleAnalyticTensorAlgebra {
 
     @Test
     fun testMean() = DoubleTensorAlgebra {
-        assertTrue { tensor2.mean() == 1.0 }
-        assertTrue { tensor2.mean(0, true) eq fromArray(
+        assertTrue { tensor5.mean() == 1.0 }
+        assertTrue { tensor5.mean(0, true) eq fromArray(
             intArrayOf(1, 2),
             doubleArrayOf(-1.0, 3.0)
         )}
-        assertTrue { tensor2.mean(1, false) eq fromArray(
+        assertTrue { tensor5.mean(1, false) eq fromArray(
             intArrayOf(2),
             doubleArrayOf(1.5, 0.5)
         )}
     }
-
 }