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MathGroup Archive 2006

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JLink, Double.NaN, and arrays

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64556] JLink, Double.NaN, and arrays
  • From: mmalsbur at vt.edu
  • Date: Wed, 22 Feb 2006 05:58:40 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Is it possible to transfer a general array of doubles from Mathematica
to a java program using JLink?

The Mathematica function MakeJavaObject can be used to convert a list
of real numbers to a double array in Java. However, the function only
works if the list contains all real numbers. However, arrays of doubles
can contain values other than real numbers. For example, the array
{1.0, 2.0, Double.NaN} is valid in Java. Mathematica errored when I
tried sending this list to Java.

The following Mathematica code illustrates the problem.

Needs["JLink`"];
InstallJava[];
LoadJavaClass["java.lang.Double"];
Double`parseDouble["1.0"] (* Returns 1.0 *)
Double`parseDouble["NaN"] (* Returns Indeterminate *)
Double`parseDouble["Infinity"]; (* Returns Infinity *)
MakeJavaObject[{1.0,2.0,3.0}] (* Returns <<JavaObject[[D]>> *)
MakeJavaObject[{1.0,2.0,Infinity}] (* Errors *)

The final line of code should ideally return a java array with the
values {1.0, 2.0, Double.POSITIVE_INFINITY}.


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