Routines (alphabetical) > Routines: H > HDF Routines > HDF_VD_ISVG

# HDF_VD_ISVG

The HDF_VD_ISVG function determines if the object associated with Id is a VGroup in an HDF file.

## Examples

Vid = HDF_VG_GETNEXT(Vgrp, -1)

PRINT, HDF_VD_ISVG(VGrp, Vid)

## Syntax

Result = HDF_VD_ISVG(VGroup, Id)

## Return Value

Returns True (1) if the object is a VGroup, or False (0) otherwise.

## Arguments

### VGroup

The VGroup handle returned by a previous call to HDF_VD_ATTACH.

### Id

The VGroup reference number obtained by a previous call to HDF_VG_GETNEXT.

## Keywords

None

## Version History

4.0 | Introduced