Passing arrays to MathLink without extra memory allocation

*To*: mathgroup at smc.vnet.net*Subject*: [mg98736] Passing arrays to MathLink without extra memory allocation*From*: axnavaei at googlemail.com*Date*: Fri, 17 Apr 2009 04:29:04 -0400 (EDT)

Hi, When passing a list/array from mathematica to c using mathlink, eg when calling MLReleaseInteger32List(), it seems mathlink allocates some memory which later has to be freed, eg using MLReleaseInteger32List(). The question is, how is it possible to pass a list from mathematica to c without this c memory allocation? This example helps to make the question more clear: Assume MyFunction [BigList] to be a function implemented in c using mathlink, where BigList is a list of integers. Since BigList has been already created in mathematica and its corresponding memory has been allocated, we do not wish to allocate memory once again in c. It looks like one option is to pass BigList by reference, that is: SetProperties[MyFunction, HoldAll] In this case, does mathlink still allocate memory and copy BigList in the c side?