Fix 'Cannot combine two tensors using ldexp'

Also, make 'ldexp' in Java comparable to C++, as the library call in
C++ does an implicit cast to int.

1 files changed, 1 insertions, 0 deletions

diff --git a/vespajlib/src/main/java/com/yahoo/tensor/Tensor.java b/vespajlib/src/main/java/com/yahoo/tensor/Tensor.java
index bdf976819bb..2ed211539d8 100644
--- a/vespajlib/src/main/java/com/yahoo/tensor/Tensor.java
+++ b/vespajlib/src/main/java/com/yahoo/tensor/Tensor.java
@@ -173,6 +173,7 @@ public interface Tensor {
     default Tensor atan2(Tensor argument) { return join(argument, Math::atan2); }
     default Tensor pow(Tensor argument) { return join(argument, Math::pow); }
     default Tensor fmod(Tensor argument) { return join(argument, (a, b) -> ( a % b )); }
+    default Tensor ldexp(Tensor argument) { return join(argument, (a, b) -> ( a * Math.pow(2.0, (int)b) )); }
     default Tensor larger(Tensor argument) { return join(argument, (a, b) -> ( a > b ? 1.0 : 0.0)); }
     default Tensor largerOrEqual(Tensor argument) { return join(argument, (a, b) -> ( a >= b ? 1.0 : 0.0)); }
     default Tensor smaller(Tensor argument) { return join(argument, (a, b) -> ( a < b ? 1.0 : 0.0)); }