private static void Npy_XDECREF(NpyArrayMultiIterObject multi)
{
if (multi == null)
{
return;
}
Npy_DECREF(multi);
}
internal static void NpyArray_MultiIter_NEXT(NpyArrayMultiIterObject multi)
{
Debug.Assert(Validate(multi));
multi.index++;
for (int i = 0; i < multi.numiter; i++)
{
NpyArray_ITER_NEXT(multi.iters[i]);
}
}
internal static NpyArrayMultiIterObject NpyArray_vMultiIterFromArrays(NpyArray[] mps, int n, int nadd, params object[] va)
{
NpyArrayMultiIterObject multi;
NpyArray current;
int i, ntot;
bool err = false;
ntot = n + nadd;
if (ntot < 2 || ntot > npy_defs.NPY_MAXARGS)
{
var msg = string.Format("Need between 2 and({0}) array objects(inclusive).", npy_defs.NPY_MAXARGS);
NpyErr_SetString(npyexc_type.NpyExc_ValueError, msg);
return(null);
}
multi = new NpyArrayMultiIterObject();
if (multi == null)
{
NpyErr_MEMORY();
return(null);
}
NpyObject_Init(multi, NpyArrayMultiIter_Type);
for (i = 0; i < ntot; i++)
{
multi.iters[i] = null;
}
multi.numiter = ntot;
multi.index = 0;
for (i = 0; i < ntot; i++)
{
if (i < n)
{
current = mps[i];
}
else
{
current = (NpyArray)va[i - n];
}
multi.iters[i] = NpyArray_IterNew(current);
}
if (!err && NpyArray_Broadcast(multi) < 0)
{
err = true;
}
if (err)
{
Npy_DECREF(multi);
return(null);
}
NpyArray_MultiIter_RESET(multi);
/* Defer creation of the wrapper - will be handled by Npy_INTERFACE. */
return(multi);
}
static void arraymultiter_dealloc(object obj)
{
NpyArrayMultiIterObject multi = obj as NpyArrayMultiIterObject;
Debug.Assert(0 == multi.nob_refcnt);
for (int i = 0; i < multi.numiter; i++)
{
Npy_XDECREF(multi.iters[i]);
}
multi.nob_magic_number = npy_defs.NPY_INVALID_MAGIC;
NpyArray_free(multi);
}
internal static NpyArrayMultiIterObject NpyArray_MultiIterNew()
{
NpyArrayMultiIterObject ret;
ret = new NpyArrayMultiIterObject();
if (null == ret)
{
NpyErr_MEMORY();
return(null);
}
NpyObject_Init(ret, NpyArrayMultiIter_Type);
/* Defer creation of the wrapper - will be handled by Npy_INTERFACE. */
return(ret);
}
internal static int NpyArray_RemoveSmallest(NpyArrayMultiIterObject multi)
{
NpyArrayIterObject it;
int i, j;
int axis;
npy_intp smallest;
npy_intp [] sumstrides = new npy_intp[npy_defs.NPY_MAXDIMS];
if (multi.nd == 0)
{
return(-1);
}
for (i = 0; i < multi.nd; i++)
{
sumstrides[i] = 0;
for (j = 0; j < multi.numiter; j++)
{
sumstrides[i] += multi.iters[j].strides[i];
}
}
axis = 0;
smallest = sumstrides[0];
/* Find longest dimension */
for (i = 1; i < multi.nd; i++)
{
if (sumstrides[i] < smallest)
{
axis = i;
smallest = sumstrides[i];
}
}
for (i = 0; i < multi.numiter; i++)
{
it = multi.iters[i];
it.contiguous = false;
if (it.size != 0)
{
it.size /= (it.dims_m1[axis] + 1);
}
it.dims_m1[axis] = 0;
it.backstrides[axis] = 0;
}
multi.size = multi.iters[0].size;
return(axis);
}
internal static int NpyArray_Broadcast(NpyArrayMultiIterObject mit)
{
return(numpyinternal.NpyArray_Broadcast(mit));
}
internal static VoidPtr NpyArray_MultiIter_DATA(NpyArrayMultiIterObject multi, int index)
{
return(numpyinternal.NpyArray_MultiIter_DATA(multi, index));
}
internal static bool NpyArray_NotDone(NpyArrayMultiIterObject multi)
{
return(numpyinternal.NpyArray_MultiIter_NOTDONE(multi));
}
internal static void NpyArray_Next(NpyArrayMultiIterObject multi)
{
numpyinternal.NpyArray_MultiIter_NEXT(multi);
}
internal static void NpyArray_Reset(NpyArrayMultiIterObject multi)
{
numpyinternal.NpyArray_MultiIter_RESET(multi);
}
internal static int NpyArray_RemoveSmallest(NpyArrayMultiIterObject multi)
{
return(numpyinternal.NpyArray_RemoveSmallest(multi));
}
internal static bool NpyArray_MultiIter_NOTDONE(NpyArrayMultiIterObject multi)
{
return(multi.index < multi.size);
}
internal static int NpyArray_Broadcast(NpyArrayMultiIterObject mit)
{
int i, nd, k, j;
npy_intp tmp;
NpyArrayIterObject it;
/* Discover the broadcast number of dimensions */
for (i = 0, nd = 0; i < mit.numiter; i++)
{
nd = Math.Max(nd, mit.iters[i].ao.nd);
}
mit.nd = nd;
/* Discover the broadcast shape in each dimension */
for (i = 0; i < nd; i++)
{
mit.dimensions[i] = 1;
for (j = 0; j < mit.numiter; j++)
{
it = mit.iters[j];
/* This prepends 1 to shapes not already equal to nd */
k = i + it.ao.nd - nd;
if (k >= 0)
{
tmp = it.ao.dimensions[k];
if (tmp == 1)
{
continue;
}
if (mit.dimensions[i] == 1)
{
mit.dimensions[i] = tmp;
}
else if (mit.dimensions[i] != tmp)
{
NpyErr_SetString(npyexc_type.NpyExc_ValueError, "shape mismatch: objects cannot be broadcast to a single shape");
return(-1);
}
}
}
}
/*
* Reset the iterator dimensions and strides of each iterator
* object -- using 0 valued strides for broadcasting
* Need to check for overflow
*/
tmp = NpyArray_OverflowMultiplyList(mit.dimensions, mit.nd);
if (tmp == npy_intp.MaxValue)
{
NpyErr_SetString(npyexc_type.NpyExc_ValueError, "broadcast dimensions too large.");
return(-1);
}
mit.size = tmp;
for (i = 0; i < mit.numiter; i++)
{
it = mit.iters[i];
it.nd_m1 = mit.nd - 1;
it.size = tmp;
nd = it.ao.nd;
if (mit.nd != 0)
{
it.factors[mit.nd - 1] = 1;
}
for (j = 0; j < mit.nd; j++)
{
it.dims_m1[j] = mit.dimensions[j] - 1;
k = j + nd - mit.nd;
/*
* If this dimension was added or shape of
* underlying array was 1
*/
if ((k < 0) ||
it.ao.dimensions[k] != mit.dimensions[j])
{
it.contiguous = false;
it.strides[j] = 0;
}
else
{
it.strides[j] = it.ao.strides[k];
}
it.backstrides[j] = it.strides[j] * it.dims_m1[j];
if (j > 0)
{
it.factors[mit.nd - j - 1] =
it.factors[mit.nd - j] * mit.dimensions[mit.nd - j];
}
}
NpyArray_ITER_RESET(it);
}
return(0);
}
internal static void NpyArray_free(NpyArrayMultiIterObject iterobj)
{
return;
}
internal static bool Validate(NpyArrayMultiIterObject multi)
{
return(null != multi && npy_defs.NPY_VALID_MAGIC == multi.nob_magic_number);
}
internal static VoidPtr NpyArray_MultiIter_DATA(NpyArrayMultiIterObject multi, npy_intp index)
{
return(multi.iters[index].dataptr);
}
