Creation of mxArray *without* memory allocation/initialization

Question

I often optimize some matlab routines by implementing them in mex. This works fine so far - but whenever creating the return mxArray, it gets preinitialized as I build it with mxCreateNumericArray.
In most of my work, I do not need the memory to be preallocated (zeroed). So sad - I can not find a matching command for that purpose (allocating memory without zeroing).

So my question could be answered in two ways:

1. Which command do I have to call for creating a mxArray without zeroing the contents?
2. How can I build a mxArray without allocating memory for Pr (and Pi)-field, which I would later allocate by mxMalloc.

One idea is building the Array with size (0,0) - but is this the ultimate solution?

Answer 1

I guess, building a size (0,0) matrix is as close as it gets to a kind of "empty" constructor. Afterwards you'll have to resize the array using mxMalloc or mxRealloc.

I doubt this will result in a noticable performance gain though, unless you're handling really large arrays.