icvDefaultSplitIdx_R和icvDefaultSplitIdx_C

static void CV_CDECL icvDefaultSplitIdx_R( int compidx, float threshold,
CvMat* idx, CvMat** left, CvMat** right,
void* userdata )
{
CvMat* trainData = (CvMat*) userdata;
int i = 0;

*left = cvCreateMat( 1, trainData->rows, CV_32FC1 );
*right = cvCreateMat( 1, trainData->rows, CV_32FC1 );
(*left)->cols = (*right)->cols = 0;
if( idx == NULL )
{
for( i = 0; i < trainData->rows; i++ )
{
if( CV_MAT_ELEM( *trainData, float, i, compidx ) < threshold )
{
(*left)->data.fl[(*left)->cols++] = (float) i;
}
else
{
(*right)->data.fl[(*right)->cols++] = (float) i;
}
}
}
else
{
uchar* idxdata;
int idxnum;
int idxstep;
int index;

idxdata = idx->data.ptr;
idxnum = (idx->rows == 1) ? idx->cols : idx->rows;
idxstep = (idx->rows == 1) ? CV_ELEM_SIZE( idx->type ) : idx->step;
for( i = 0; i < idxnum; i++ )
{
index = (int) *((float*) (idxdata + i * idxstep));
if( CV_MAT_ELEM( *trainData, float, index, compidx ) < threshold )
{
(*left)->data.fl[(*left)->cols++] = (float) index;
}
else
{
(*right)->data.fl[(*right)->cols++] = (float) index;
}
}
}
}

static void CV_CDECL icvDefaultSplitIdx_C( int compidx, float threshold,
CvMat* idx, CvMat** left, CvMat** right,
void* userdata )
{
CvMat* trainData = (CvMat*) userdata;
int i = 0;

*left = cvCreateMat( 1, trainData->cols, CV_32FC1 );
*right = cvCreateMat( 1, trainData->cols, CV_32FC1 );
(*left)->cols = (*right)->cols = 0;
if( idx == NULL )
{
for( i = 0; i < trainData->cols; i++ )
{
if( CV_MAT_ELEM( *trainData, float, compidx, i ) < threshold )
{
(*left)->data.fl[(*left)->cols++] = (float) i;
}
else
{
(*right)->data.fl[(*right)->cols++] = (float) i;
}
}
}
else
{
uchar* idxdata;
int idxnum;
int idxstep;
int index;

idxdata = idx->data.ptr;
idxnum = (idx->rows == 1) ? idx->cols : idx->rows;
idxstep = (idx->rows == 1) ? CV_ELEM_SIZE( idx->type ) : idx->step;
for( i = 0; i < idxnum; i++ )
{
index = (int) *((float*) (idxdata + i * idxstep));
if( CV_MAT_ELEM( *trainData, float, compidx, index ) < threshold )
{
(*left)->data.fl[(*left)->cols++] = (float) index;
}
else
{
(*right)->data.fl[(*right)->cols++] = (float) index;
}
}
}
}