Emgu CV Library Documentation
cvGetReal1D Method (arr, idx0)
NamespacesEmgu.CVCvInvokecvGetReal1D(IntPtr, Int32)

www.emgu.com/wiki
Return the particular element of single-channel array. If the array has multiple channels, runtime error is raised. Note that cvGet*D function can be used safely for both single-channel and multiple-channel arrays though they are a bit slower.
Declaration Syntax
C#Visual BasicVisual C++
public static double cvGetReal1D(
	IntPtr arr,
	int idx0
)
Public Shared Function cvGetReal1D ( _
	arr As IntPtr, _
	idx0 As Integer _
) As Double
public:
static double cvGetReal1D(
	IntPtr arr, 
	int idx0
)
Parameters
arr (IntPtr)
Input array. Must have a single channel
idx0 (Int32)
The first zero-based component of the element index
Return Value
the particular element of single-channel array

Assembly: Emgu.CV (Module: Emgu.CV) Version: 1.3.0.0 (1.3.0.0)