David Cournapeau wrote: > Andrew Straw wrote: > >> David Cournapeau wrote: >> >> >>> - To send data from the calling process to matlab, you first have to >>> create a mxArray, which is the basic matlab handler of a matlab array, >>> and populating it. Using mxArray is very ackward : you cannot create >>> mxArray from existing data, you have to copy data to them, etc... >>> >>> >> My understanding, never having done it, but from reading the docs, is >> that you can create a "hybrid array" where you manage the memory. Thus, >> you can create an mxArray from existing data. However, the docs >> basically say that this is too hard for most mortals (and they may well >> be right -- too painful for me, anyway)! >> >> > Would you mind telling me where you found that information ? Because > right now, I am wasting a lot of cycles because of memory copy in both > directions, and it is sometimes slow enough so that it is annoying, > I found it reading through the in-program help (the C-API section, whatever it's called) on a Matlab installation at my university. I guess this was Matlab 2006A. A quick Google search turns this up:
http://www.mathworks.com/access/helpdesk/help/techdoc/matlab_external/index.html?/access/helpdesk/help/techdoc/matlab_external/f25255.html They give the following example, which seems to create a Matlab array "pArray" with data owned by the C variable "data": mxArray *pArray = mxCreateDoubleMatrix(0, 0, mxREAL); double data[10]; mxSetPr(pArray, data); mxSetM(pArray, 1); mxSetN(pArray, 10); ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
