Re: Using Mathlink to export arrays

*To*: mathgroup at smc.vnet.net*Subject*: [mg67130] Re: Using Mathlink to export arrays*From*: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>*Date*: Sat, 10 Jun 2006 04:53:22 -0400 (EDT)*Organization*: Uni Leipzig*References*: <e6b4ve$cn5$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hi, a) using char, short, int is not your problem b) when you pass the data not with Manual to your function your C-program store it twice. To avoid thiy you must pass the data as Manual get the list in the C-program copy it to your data and dispose the data in the link. c) since Mathematica hold the data always ans int you should only pass int to the C-program and check in your C-code what data type fits for the range of the input array d) for doubles you can setup a second pattern Regards Jens "Amy" <amy.squillacote at kitware.com> schrieb im Newsbeitrag news:e6b4ve$cn5$1 at smc.vnet.net... | Hi, | | I am using Mathlink to move arrays with depth=3 from Mathematica | (version 5.2) into a C++ program I am developing. I want to represent | the data in my program as fully as possible (i.e., avoid casting to | another data type), but I also don't want to use more memory than is | necessary to store the data. My program handles arrays of any type of | integer data (short integer, integer, and long integer) as well | floating-point data (stored as float, not double, in C++). I am trying | to figure out how to determine from Mathematica what type (and which | MLGet***Array method) I should use based on the data array coming from | Mathematica. | | I first tried the following. | | if (MLGetShortIntegerArray(...)) | { | // do something | } | else if (MLGetIntegerArray(...)) | { | // do something else | } | else if (MLGetLongIntegerArray(...)) | { | // do something else | } | else if (MLGetFloatArray(...)) | { | // do something else | } | else | { | // fail | } | | I thought if I passed in floating-point data that the | MLGet***IntegerArray methods would return 0 (for failure), but they did | not. Instead the MLGetShortIntegerArray method was used, and the | floating-point data in the array was cast to a short integer type. | | I then tried to change my .tm file so the Pattern only accepted integer | arrays (intending to create a separate function for handling | floating-point arrays), but I could not get that to work either; | neither my integer or floating point arrays were accepted. The relevant | excerpt from my .tm file follows. | | :Begin: | :Function: MyFunction | :Pattern: MyFunction[x_?ArrayQ[#, IntegerQ]] | :Arguments: {x} | :ArgumentTypes: {Manual} | :ReturnType: Integer | :End: | | Any insights? | | - Amy |