How do you access a single value returned from a JA builder jar

Question

Kevyn 2013-6-4

I have a matlab function that returns a single value (or a 1x1 Double)

I have built it into a Jar using JA builder and am calling it from a test java program.

The return type when called from Java is a java.lang.Object[1] - fine so far

When I convert it to using ((MWNumericArray)retVal[0]).getDoubleData() I get a double[0] array!!

There is no value

What am I doing wrong?

Answer 1

Kevyn 2013-6-5

I figured out why it was happening - I was passing in my input parameters as java types and assuming that they would be converted.

If I do the conversion myself then the I get a sensible return value that I can access using ((MWNumbericArray)retVal[0]).getDouble()